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Historical Information
1. Dam Name: Coho Dam
2. Estimate height of dam in feet 5- high, 114- long, 7- wide at the bottom, 3- wide at the top with a 7- wide notch
3. Dam Type:
a) earthfill dam
b) concrete arch dam - X
c) gravity dam
d) masonry dam
e) timber cribs
f) other, please explain _____________________________________________________
4. Location Description: The Coho Dam is located on the Huron River in the Milan Wildlife Area.
5. Year Constructed: 1960s Year Removed: 2003
6. Dam Owner:
a) public ODNR, Division of Wildlife
b) private
c) abandoned
a) generate hydropower ____
b) irrigation ____
c) domestic water supply ____
d) navigation ____
e) flood control ____
f) recreation ____
g) industrial water supply ____
h) unknown _____
8. What repairs have been done to the dam? Racks were repaired and some erosion around the dam were repaired.
9. Reason(s) for Removal:
a) aesthetic enhancement - X
b) fish and wildlife habitat improvement - X c) cost savings ____
d) community revitalization ____
e) public safety hazard - X
f) water quality improvement - X
g) recreational improvement - X
h) alternative to dam - X
10. Project Sponsor (who initiated project): ODNR, Division of Wildlife
11. Dam Removal Funding Sources:
a) federal
b) state - ODNR, Division of Wildlife
c) local governmental agencies
d) other (please explain)
12. Cost of Dam Removal: $ 20,000
13. List all Contractors by Name, include Address and Telephone #:
1) Ed Burdue & Co., 3025 Venice Rd., Sandusky, OH 44870
2)
3)
a) federal ____
b) state____
c) municipal ____
a) before removal - X
b) during removal - X
c) after removal - X
a) before removal - If the dam was considered in a portion of the Huron River considered to be navigable waters of the state a permit would be required under Section 10 of the Rivers and Harbors Act of 1899. For permitting purposes, the Huron River is considered navigable from the mouth to Milan, Ohio, about 10 miles upstream from the mouth. The dam to be removed is located between 14 and 15 miles upstream from the mouth. Therefore, the project did not require a permit under Section 10 of the Rivers and Harbors act of 1899.
b) during removal - Had to wait until July because of high waters in the winter and spawning in the early spring.
c) after removal - Stream looks good.
a) Estimated Reservoir Area in acres -
b) Composition of river bed (eg. sand, pebbles, boulders, bedrock)-
The dam sits on bedrock and the substrate upstream and downstream is mainly bedrock. The material behind the dam consists predominately of shale chips mixed with some sand.
c) Types of Fish caught in the river - smallmouth bass, rock bass, crappie, channel catfish
d) Water Quality
i) behind the dam - Good - X Fair Poor
ii) below the dam - Good ? X Fair Poor
18. Were any studies of the river conducted before the dam was removed?
Yes or No.
If yes, who conducted the studies and who is the contact for obtaining them?
19. Have studies been conducted on the river after the dam was removed to document changes in the river?
Yes or No
If yes, who conducted the studies and who is the contact for obtaining them?
A GIS based study is available after removal for this dam.
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
UPSTREAM CHANNEL CHANGES FOLLOWING DAM CONSTRUCTION
AND REMOVAL USING A GIS/REMOTE SENSING APPROACH1
James E. Evans, Jennifer M. Huxley, and Robert K. Vincent2
(Download this study now. 724 Kb PDF)
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