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Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mile point 18.6, along State Route 65, Ambridge, Beaver County, PA

Ohio Slack Water Dams, Lock & Dam No. 4, East bank of Ohio River at mi...

Significance: Ohio Slack Water Dams, Lock and Dam No. 4, HAER No. PA-227-A was part of the fifty-two slackwater locks and dams constructed by the U.S. Army Corps of Engineers on the Ohio River, between 1877-191... More