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View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A diversion dam slows the waters of the South Platte River in Waterton Canyon in Jefferson County, Colorado, in plain sight of one of metropolitan Denver's favorite workout venues. It's the wide canyon trail where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

A diversion dam slows the waters of the South Platte River in Waterton...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Distance hikers Heather and Richard Moutoux, of Boulder, Colorado, are off on perhaps the walk of a lifetime. They will soon leave the 6.2-mile Waterton Canyon Trail, which follows the South Platte River's course from Jefferson into Douglas counties below Denver, onto the exponentially more challenging Colorado Trail. The latter, which begins in Waterton Canyon, winds 486 miles south through the Rocky Mountains, all the way to Durango in the southwest corner of the state

Distance hikers Heather and Richard Moutoux, of Boulder, Colorado, are...

Title, date and keywords based on information provided by the photographer. The Colorado Trail is less than a fourth as long as the nation's longest footpath, the Appalachian Trail in the East. Still, 486 miles... More

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Canyon trail with human outdoor enthusiasts. The wide, scenic trail in Jefferson County, Colorado, is one of metropolitan Denver's favorite workout vanues, where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Cany...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

The South Platte River, coursing through Waterton Canyon in Jefferson County, Colorado. There, the Denver Water utility dams the river twice and captures its water for consumption in metropolitan Denver, while active Coloradans hike, bike, and ride horses on the wide Waterton Canyon Trail beside the rushing stream

The South Platte River, coursing through Waterton Canyon in Jefferson ...

Title, date and keywords based on information provided by the photographer. Gift; Carol M. Highsmith Photography, Inc.; 2017; (DLC/PP-2002:038-13). Forms part of: Gates Frontiers Fund Colorado Collection within... More

View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A diversion dam slows the waters of the South Platte River in Waterton Canyon in Jefferson County, Colorado, in plain sight of one of metropolitan Denver's favorite workout venues. It's the wide canyon trail where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

A diversion dam slows the waters of the South Platte River in Waterton...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A sign in the 6.2-mile Waterton Canyon Trail, which follows the South Platte River's course from Jefferson into Douglas counties below Denver, alerting canyon users to that the trailhead for the exponentially more challenging Colorado Trail is ahead. The latter, which begins in Waterton Canyon, winds 486 miles south through the Rocky Mountains, all the way to Durango in the southwest corner of the state

A sign in the 6.2-mile Waterton Canyon Trail, which follows the South ...

Title, date and keywords based on information provided by the photographer. Still, the Colorado Trail is less than a fourth as long as the nation's longest footpath,the Appalachian Trail in the East Credit line... More

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside the South Platte River, which rushes through Waterton Canyon, one of Colorado outdoor enthusiasts' favorite venues. Above the river, a 6.2-mile hiking, biking, and horseback-riding trail winds between Jefferson and Douglas counties within the canyon, below Denver

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside t...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

In full view of some Rocky Mountain bighorn sheep, the roaring Strontia Springs diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver, Colorado. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres

In full view of some Rocky Mountain bighorn sheep, the roaring Stronti...

Title, date and keywords based on information provided by the photographer. Most of this takes place in plain sight of one of metropolitan Denver's favorite workout venues, the Waterton Canyon Trail, where bicy... More

View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Bikers and hikers take a break at a shelter along the 6.2-mile-long Waterton Canyon Trail, which crosses from Jefferson to Douglas counties in Colorado, below Denver. The trail, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

Bikers and hikers take a break at a shelter along the 6.2-mile-long Wa...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Canyon trail with human outdoor enthusiasts. The wide, scenic trail in Jefferson County, Colorado, is one of metropolitan Denver's favorite workout venues, where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Cany...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Wildflowers above the South Platte River in Waterton Canyon, where one of Colorado outdoor enthusiasts' favorite hiking, biking, and horseback trails winds between Jefferson and Douglas counties, below Denver

Wildflowers above the South Platte River in Waterton Canyon, where one...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts...

Title, date and keywords based on information provided by the photographer. Most of this takes place in plain sight of one of metropolitan Denver's favorite workout venues; the 6.2-mile Waterton Canyon Trail th... More

Fishermen try their luck in the South Platte River as it crosses from Douglas into to Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

Fishermen try their luck in the South Platte River as it crosses from ...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside the South Platte River, which rushes through Waterton Canyon, one of Colorado outdoor enthusiasts' favorite venues. Above the river, a 6.2-mile hiking, biking, and horseback-riding trail winds between Jefferson and Douglas counties within the canyon, below Denver

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside t...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Canyon trail with human outdoor enthusiasts. The wide, scenic trail in Jefferson County, Colorado, is one of metropolitan Denver's favorite workout venues, where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Cany...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside the South Platte River, which rushes through Waterton Canyon, one of Colorado outdoor enthusiasts' favorite venues. Above the river, a 6.2-mile hiking, biking, and horseback-riding trail winds between Jefferson and Douglas counties within the canyon, below Denver

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside t...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Distant view of the Strontia Springs Dam in Douglas, County, Colorado, which diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver

Distant view of the Strontia Springs Dam in Douglas, County, Colorado,...

Title, date and keywords based on information provided by the photographer. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres... More

Distance hikers Heather and Richard Moutoux, of Boulder, Colorado, are off on perhaps the walk of a lifetime. They will soon leave the 6.2-mile Waterton Canyon Trail, which follows the South Platte River's course from Jefferson into Douglas counties below Denver, onto the exponentially more challenging Colorado Trail. The latter, which begins in Waterton Canyon, winds 486 miles south through the Rocky Mountains, all the way to Durango in the southwest corner of the state

Distance hikers Heather and Richard Moutoux, of Boulder, Colorado, are...

Title, date and keywords based on information provided by the photographer. The Colorado Trail is less than a fourth as long as the nation's longest footpath, the Appalachian Trail in the East. Still, 486 miles... More

View of the South Platte River as it flows through Waterton Canyon from Douglas County into Jefferson County, Colorado, below Denver. The 6.2-mile Waterton Canyon Trail along the river, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

View of the South Platte River as it flows through Waterton Canyon fro...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts...

Title, date and keywords based on information provided by the photographer. Most of this takes place in plain sight of one of metropolitan Denver's favorite workout venues; the 6.2-mile Waterton Canyon Trail th... More

A bicyclist in a Colorado-flag-themed T-shirt leaves the 6.2-mile Waterton Canyon Trail, which follows the South Platte River's course from Jefferson into Douglas counties below Denver, onto the exponentially more challenging Colorado Trail. The latter, which begins in Waterton Canyon, winds 486 miles south through the Rocky Mountains, all the way to Durango in the southwest corner of the state

A bicyclist in a Colorado-flag-themed T-shirt leaves the 6.2-mile Wate...

Title, date and keywords based on information provided by the photographer. The Colorado Trail is less than a fourth as long as the nation's longest footpath, the Appalachian Trail in the East. Still, the biker... More

Wildflowers above the South Platte River in Waterton Canyon, where one of Colorado outdoor enthusiasts' favorite hiking, biking, and horseback trails winds between Jefferson and Douglas counties, below Denver

Wildflowers above the South Platte River in Waterton Canyon, where one...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts...

Title, date and keywords based on information provided by the photographer. Most of this takes place in plain sight of one of metropolitan Denver's favorite workout venues; the 6.2-mile Waterton Canyon Trail th... More

Of note on the Waterton Canyon Trail in Waterton Canyon in Jefferson County, Colorado, one of metropolitan Denver's favorite workout venues, besides the bicylists, hikers, walkers, and horseback riders, is the little box on the roadside sign. In it is a sophsticated sensor that collects a usage count on the trail by detecting passersby's body heat. The trail is a patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

Of note on the Waterton Canyon Trail in Waterton Canyon in Jefferson C...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A rider on a recreational tricycle zips along the 6.2-mile Waterton Canyon Trail, which follows the South Platte River as it crosses between Jefferson and Douglas River below Denver. The canyon, managed by the Denver Water utility and the U.S. Forest Service, is one of Colorado's favorite venues for hikers, bikers, and horseback riders

A rider on a recreational tricycle zips along the 6.2-mile Waterton Ca...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

View of the South Platte River as it flows through Waterton Canyon from Douglas County into Jefferson County, Colorado, below Denver. The 6.2-mile Waterton Canyon Trail along the river, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

View of the South Platte River as it flows through Waterton Canyon fro...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside the South Platte River, which rushes through Waterton Canyon, one of Colorado outdoor enthusiasts' favorite venues. Above the river, a 6.2-mile hiking, biking, and horseback-riding trail winds between Jefferson and Douglas counties within the canyon, below Denver

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside t...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Fishermen try their luck in the South Platte River as it crosses from Douglas into to Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

Fishermen try their luck in the South Platte River as it crosses from ...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Fishermen try their luck in the South Platte River as it crosses from Douglas into to Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

Fishermen try their luck in the South Platte River as it crosses from ...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Canyon trail with human outdoor enthusiasts. The wide, scenic trail in Jefferson County, Colorado, is one of metropolitan Denver's favorite workout venues, where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Cany...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside the South Platte River, which rushes through Waterton Canyon, one of Colorado outdoor enthusiasts' favorite venues. Above the river, a 6.2-mile hiking, biking, and horseback-riding trail winds between Jefferson and Douglas counties within the canyon, below Denver

A Rocky Mountain bighorn sheep and her ewe amble on the rocks beside t...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Stairs down to an old pulley system that once carried water-speed measurement equipment over and into the South Platte River in Waterton Canyon, which crosses from Jefferson to Douglas counties in Colorado, below Denver. The 6.2-mile Waterton Canyon Trail along the river, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

Stairs down to an old pulley system that once carried water-speed meas...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

A Rocky Mountain bighorn sheep ewe takes a swim in the South Platte River, which rushes through Waterton Canyon, one of Colorado outdoor enthusiasts' favorite venues. Above the river, a 6.2-mile hiking, biking, and horseback-riding trail winds between Jefferson and Douglas counties within the canyon, below Denver

A Rocky Mountain bighorn sheep ewe takes a swim in the South Platte Ri...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

View of the South Platte River as it flows through Waterton Canyon from Douglas County into Jefferson County, Colorado, below Denver. The 6.2-mile Waterton Canyon Trail along the river, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

View of the South Platte River as it flows through Waterton Canyon fro...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

The South Platte River, coursing through Waterton Canyon in Jefferson County, Colorado. There, the Denver Water utility dams the river twice and captures its water for consumption in metropolitan Denver, while active Coloradans hike, bike, and ride horses on the wide Waterton Canyon Trail beside the rushing stream

The South Platte River, coursing through Waterton Canyon in Jefferson ...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Canyon trail with human outdoor enthusiasts. The wide, scenic trail in Jefferson County, Colorado, is one of metropolitan Denver's favorite workout venues, where bicylists, hikers, walkers, and horseback riders exercise in a beautiful, invigorating, patrolled environment managed by Denver Water, the city's public water utility, and the U.S. Forest Service

Young Rocky Mountain bighorn sheep rams calmly share the Waterton Cany...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Distance hikers Heather and Richard Moutoux, of Boulder, Colorado, are off on perhaps the walk of a lifetime. They will soon leave the 6.2-mile Waterton Canyon Trail, which follows the South Platte River's course from Jefferson into Douglas counties below Denver, onto the exponentially more challenging Colorado Trail. The latter, which begins in Waterton Canyon, winds 486 miles south through the Rocky Mountains, all the way to Durango in the southwest corner of the state

Distance hikers Heather and Richard Moutoux, of Boulder, Colorado, are...

Title, date and keywords based on information provided by the photographer. The Colorado Trail is less than a fourth as long as the nation's longest footpath, the Appalachian Trail in the East. Still, 486 miles... More

An old mining tunnel, high above Waterton Canyon, which carries the South Platte River from Jefferson to Douglas counties in Colorado, below Denver. The 6.2-mile Waterton Canyon Trail along the river, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

An old mining tunnel, high above Waterton Canyon, which carries the So...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

In full view of some Rocky Mountain bighorn sheep, the roaring Strontia Springs Dam in Douglas, County, Colorado, diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres

In full view of some Rocky Mountain bighorn sheep, the roaring Stronti...

Title, date and keywords based on information provided by the photographer. Most of this takes place in plain sight of one of metropolitan Denver's favorite workout venues; the 6.2-mile Waterton Canyon Trail th... More

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts water from a giant reservoir into a 3.4 mile-long tunnel under the mountains to the Foothills Water Treatment Plant near Denver. Completed in 1983, this dam towers 243 feet above the South Platte River streambed, forming a 1.7-mile-long lake with 98 surface acres

The roaring Strontia Springs Dam in Douglas, County, Colorado, diverts...

Title, date and keywords based on information provided by the photographer. Most of this takes place in plain sight of one of metropolitan Denver's favorite workout venues, the 6.2-mile Waterton Canyon Trail th... More

View of the South Platte River as it crosses from Douglas into Jefferson County, Colorado, in Waterton Canyon, south of Denver. The 6.2-mile trail along the canyon, which is managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite hiking, biking, and horseback-riding venues

View of the South Platte River as it crosses from Douglas into Jeffers...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More

Bikers and hikers take a break at a shelter along the 6.2-mile-long Waterton Canyon Trail, which crosses from Jefferson to Douglas counties in Colorado, below Denver. The trail, managed by the Denver Water utility and the U.S. Forest Service, is one of fitness-conscious Coloradans' favorite exercise venues

Bikers and hikers take a break at a shelter along the 6.2-mile-long Wa...

Title, date and keywords based on information provided by the photographer. Credit line: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photograp... More