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Blackburn Crossing Dam

Type:

Rolled Earth Fill with

impervious core and compacted

pervious 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 connected

to 8.5 foot diameter concrete

conduit

Two 3-foot diameter by-pass

outlets for low flow

Location:

Center of dam

Invert Elevation:

290.0 feet-msl for 8.5 ft conduit

309.5 feet-msl (lowest slide

gate)

312.5, 322.5, and 332.5 ft-msl

for other slide gate

Reservoir

Conservation Pool Elevation:

345.0 feet-msl

Capacity at Conservation Pool:

411,840 acre feet