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UNITED STATES

DEPARTMENT OF THE INTERIOR
Fred A. Seaton, Secretary

us BUREAU OF RECLAMATION

Wilbur A. Dexheimer, Commissioner

L. N. McClellan, Assistant Commissioner and Chief Engineer

TECHNICAL RECORD

OF

DESIGN AND CONSTRUCTION

TRENTON DAM

Constructed 1949-1953

Meeker-Driftwood Unit
Frenchman-Cambridge Division
Missouri River Basin Project

Denver, Colorado

1957

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Slope protection: Riprap on gravel blanket on upstream face, seeded topsoil on downstream face Dimensions:

Height: 144 feet above lowest ex-
cavation in cutoff trench, 100
feet above riverbed

Crest length: 8, 600 feet
Crest elevation: 2793.0
Crest roadway width: 30 feet
Volume: 7,800,000 cubic yards
Slopes: Upstream, 6 to 1 to ele-
vation 2710, 3 to 1 to elevation
2760, and 2-1/2 to 1 to eleva-
tion 2793

Downstream, 10 to 1 to elevation 2710, 4 to 1 to elevation 2735, 2-1/2 to 1 to elevation 2760, and 2 to 1 to elevation 2793

Dam (Continued)

Main cutoff trench:

50-foot base width

with 1-1/2 to 1 side slopes, length about 6, 760 feet

Auxiliary cutoff trench: 50-foot base width with 1-1/2 to 1 side slopes, length about 570 feet

Spillway

Type: Concrete overflow chute type with stilling basin

Crest length of overflow section: 126 feet

Crest: Elevation 2743.00

Maximum discharge: 126,500 secondfeet at water surface elevation 2785.6 (as determined by model studies) Gates: Three, 42 by 30 feet

Stilling basin: Reinforced concrete with dentated sills

River Outlets

Outlets: Two

Invert: Elevation 2710.00

Gates: Four, 6 by 7.5 feet (two are installed in each outlet)

Discharge capacity: 1,000 second-feet with reservoir water surface elevation at 2720.0

Canal Outlet Works

Intake structure:

Vertical shaft: 50 feet high

Sill elevation: 2710.00

Outlet conduit: 5 feet 6 inches in diam-
eter, 208 feet long

Outlet pipe: 56-inch-diameter pipe in
horseshoe conduit, 244 feet long
Gates: Two, 4 by 4 feet (one is in-
stalled in the emergency gate chamber
and the other in the control house)
Discharge capacity: 300 second-feet
with reservoir water surface eleva-
tion 2720.0, and canal water elevation
2705.0

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AERIAL VIEW OF TRENTON DAM SPILLWAY DURING DEDICATION CEREMONIES October 1, 1953

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