Quick Facts About Upper Stillwater Dam
Upper Stillwater Dam Map
Upper Stillwater Dam Information
Upper Stillwater Dam is a concrete gravity dam located about 36 miles from Duchesne, Duchesne, Utah.
The dam, which is on the Rock Creek River, was primarily built for Irrigation purposes, but also serves for Recreation and Water Supply benefits.
The dam was designed by and commissioned in 1986 and is currently owned by US Bureau of Reclamation.
Upper Stillwater Dam Structure
The Upper Stillwater Dam is approximately 2,660 feet (811 m) long, 285 feet (87 m) high and has a structural volume of 1,470,000 cubic yards (1,123,896 cubic metres).
Upper Stillwater Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 33,123 acre-ft (40,857 Ml) and maximum capacity of 35,253 acre-ft (43,484 Ml).
The surface area of the reservoir is 329 acres (133 ha) and the total catchment area is 102 square miles (264 square kilometres).
Upper Stillwater Dam Spillway
The dam has a 600 feet (183 m) wide uncontrolled spillway with a maximum discharge capacity of 75000 cubic feet per second (2124 cubic metres per second).
Upper Stillwater Dam Compared to Four Famous American Dams
| Upper Stillwater Dam Duchesne, Utah |
Hoover Dam Clark County, Nevada |
Grand Coulee Dam Okanogan County, Washington |
Theodore Roosevelt Dam Maricopa County, Arizona |
Glen Canyon Dam Coconino County, Arizona |
|
|---|---|---|---|---|---|
| Height (ft) | 285 | 730 | 550 | 357 | 216 |
| Length (Ft) | 2,660 | 1,244 | 5,673 | 6,920 | 1,565 |
| Storage Volume (acre-ft) | 35,253 | 30,237,000 | 9,562,000 | 3,540,000 | 29,875,000 |
| Drainage Area (sq miles) | 102 | 167,800 | 74,100 | 3,611 | 108,355 |
Upper Stillwater Dam Weather
Current Conditions at Upper Stillwater Dam
| Parameter | Value |
|---|---|
| Current Time | 19:22 |
| Sunrise | 07:13 |
| Sunset | 18:00 |
| Temperature (°F) | 14 |
| Feels Like (°F) | 2 |
| Cloud Coverage (%) | 81 |
| Pressure (inHg) | 1017 |
| Humidity (%) | 89 |
| Wind Speed (mph) | 10 |
| Rain (mm) | 0 |
7-Day Forecast for Upper Stillwater Dam
| Day | Min Temp (°F) | Max Temp (°F) | Feels Like (°F) | Pressure (inHg) | Humidity (%) | Wind Speed (mph) | Wind Gust (mph) | Wind Dir | Precip Prob (%) | Precip Volume (mm) | Weather |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Today | 12 | 24 | 13 | 1012 | 77 | 15 | 35 | WNW | 100 | - |  |
| Tue | 6 | 21 | 10 | 1019 | 71 | 12 | 21 | NW | 56 | - | |
| Wed | 6 | 27 | 22 | 1017 | 63 | 11 | 11 | NNW | 66 | - | |
| Thu | 7 | 26 | 22 | 1016 | 74 | 10 | 11 | NNW | 99 | - | |
| Fri | 7 | 26 | 20 | 1022 | 73 | 10 | 9 | NNW | 0 | - |  |
| Sat | 13 | 31 | 23 | 1020 | 68 | 11 | 11 | NNW | 0 | - |  |
| Sun | 16 | 33 | 26 | 1023 | 82 | 11 | 12 | NNW | 0 | - |  |
| Mon | 23 | 33 | 25 | 1021 | 94 | 12 | 28 | NW | 67 | - | |
Upper Stillwater Dam Frequently Asked Questions
Upper Stillwater Dam is in Utah.
Upper Stillwater Dam is in Duchesne County.
Upper Stillwater Dam is 285 feet high.
Upper Stillwater Dam is 2,660 feet long.
Condition Assessment Classification
Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor
A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner’s property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Source: National Inventory of Dams