Blackburn Crossing Dam
Type: |
Rolled Earth Fill withimpervious core and compactedpervious outer zones |
Length: |
5,720 feet (including spillway) |
Maximum Height: |
75 feet |
Top Width: |
20 to 21.3 feet |
Top of Dam Elevation: |
364.0 feet-msi |
Drainage Area: |
847 square miles total |
Service Spillway
Type: |
Uncontrolled Concrete Ogee Weir |
Location: |
East side of dam |
Crest Length: |
500 feet |
Crest Elevation: |
345.0 feet-msl |
Capacity at 348 ft-msl: |
8,430 cfs approx. |
Capacity at 350 ft-msl: |
20,000 cfs approx. |
Capacity at 354 ft-msl: |
60,000 cfs approx. |
Capacity at 361 ft-msl: |
132,000 cfs approx. |
Inlet-Outlet Works
Type: |
Two 5x7 foot gates connectedto 8.5 foot diameter concreteconduitTwo 3-foot diameter by-passoutlets for low flow |
Location: |
Center of dam |
Invert Elevation: |
290.0 feet-msl for 8.5 ft conduit309.5 feet-msl (lowest slidegate)312.5, 322.5, and 332.5 ft-mslfor other slide gate |
Reservoir
Conservation Pool Elevation: |
345.0 feet-msl |
Capacity at Conservation Pool: |
411,840 acre feet |