MT00579 - Tiber Dam


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Tiber Dam


	Statistics

General

Region (Map) : .................. Great Plains

State (Map) ....................... Montana

County ............................... Liberty

Project: ............................... PSMBP-Lower Marias

Dam type: ........................... Earthfill

Location: ............................ Near Chester

Watercorse: ....................... Marias River

Reservoir: ........................... Lake Elwell

Construction Date: .......... 1952-1957

National ID Number ......... MT00579

Hydrologic Unit Code ....

Dimensions

Crest Elevation of Dam: .................. 3026 ft

Structural Height of Dam: ................. 206.0 ft

Crest Length: ...................................... 4,300.0 ft

Top of Joint Use: ........................................ NA

Top of Active Conservation: ........... 2,992.3 ft

Top of Inactive Conservation: ......... 2,967.0 ft

Spillway Crest: .................................... 2,975.0 ft

Top of Dead Storage: ........................ 2,870.0 ft

Streambed at Dam Axis : ................... 2,823.0 ft

Hydraulics

Normal Water Surface Elev: .............. 2,993.0 ft

Hydraulic Height: .............................. 189.0 ft

Service Spillway Type:

Uncontrolled Crest ................................Yes

Morning-Glory ........................................... No

Crest Length ........................................... NA

Gated ..................................................... Yes

Capacity at Elev: 3,012.5 ft, 68,470 cfs

Auxiliary Spillway ......................................... No

Capacity at Elev. .................................. 0 cfs

Outlet Works Capacity at

Elevation 3,029.2 ft., ...................... 5,845 cfs

Hydrology

Drainage Area: ................................. 4,375sq mi

Hydrometeorological Report HMR xx

Flood Type: ........................................... General

Storm Duration: ....................................... 72 hrs

Probable Maximum Flood (PMF) Report:

Peak Inflow: ............................... 695,000 cfs

Inflow Volume: .................... 1,443,000 acre-ft

Flow Duration: ................................. 15 days

PMF Routing MWS Elev.: .............. 3,029.4 ft

Initial Routing Elev: ......................... 3,008.1 ft

Study Date: ............................... October, 1989

Power Generation

Power Generation at Dam Site - None

Bureau of Reclamation Power Program

Narration

Geology

Bedrock in the area consists of Upper Cretaceous Colorado Shale and Telegraph Creek formations. The Telegraph Creek Formation and Colorado Shale Formation were exposed by erosion of the overlying Telegraph Creek formation and are covered with glacial till and thin alluvial deposits. The Colorado Shale, of marine origin, is dense, silty, hard, and fissile. It contains =numerous thin bentonite seams and some sandstone. The nonmarine Telegraph Creek Formation consists of shale and interbedded sandstone with gypsum-filled cavities and veins. At the abutments, glacial till up to 25 feet thick rests on the Telegraph Creek Formation.

Links

| Recreation |

| Dams Located by State | USBR Montana Dams | North Great Plains Region Dams |

| Owner: Bureau of Reclamation, Montana Area Office,
PO Box 30137, Billings, MT 59107-0137, (406) 247-7664

| Operator: Bureau of Reclamation, Montana Area Office,
PO Box 30137, Billings, MT 59107-0137, (406) 247-7664