Hebgen Dam Quick Facts
Hebgen Dam Map
Hebgen Dam Information
Hebgen Dam is an earthen embankment dam located about 55 miles from Ennis, Mt, Gallatin, Montana.
The dam, which is on the Madison River, was primarily built for Hydroelectric purposes, but also serves for Recreation, Water Supply and Flood Risk Reduction benefits.
The dam was designed by and commissioned in 1915 and is currently owned by NorthWestern Energy.
Hebgen Dam Structure
The Hebgen Dam is approximately 721 feet (220 m) long, 88 feet (27 m) high and has a structural volume of cubic yards (0 cubic metres).
Hebgen Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 386,000 acre-ft (476,123 Ml) and maximum capacity of 525,620 acre-ft (648,342 Ml).
The surface area of the reservoir is 13,000 acres (5,261 ha) and the total catchment area is 905 square miles (2,344 square kilometres).
Hebgen Dam Spillway
The dam has a 47 feet (14 m) wide controlled spillway with a maximum discharge capacity of 4400 cubic feet per second (125 cubic metres per second).
Hebgen Dam Compared to Five Famous American Dams
Hebgen Dam Weather
Current Conditions at Hebgen Dam
Parameter | Value |
---|---|
Current Time | 18:14 |
Sunrise | 07:19 |
Sunset | 16:59 |
Temperature (°F) | 18 |
Feels Like (°F) | 13 |
Cloud Coverage (%) | 57 |
Pressure (inHg) | 1024 |
Humidity (%) | 91 |
Wind Speed (mph) | 3 |
Rain (mm) | 0 |
7-Day Forecast for Hebgen 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 | 11 | 33 | 25 | 1012 | 83 | 8 | 13 | NW | 100 | - | |
Wed | 12 | 31 | 21 | 1020 | 75 | 10 | 20 | S | 0 | - | |
Thu | 14 | 33 | 25 | 1017 | 83 | 8 | 14 | SSW | 0 | - | |
Fri | 20 | 35 | 32 | 1004 | 78 | 5 | 9 | NNW | 100 | - | |
Sat | 17 | 31 | 30 | 1014 | 82 | 5 | 9 | S | 100 | - | |
Sun | 16 | 27 | 16 | 1017 | 81 | 10 | 16 | S | 20 | - | |
Mon | 17 | 29 | 24 | 1008 | 90 | 5 | 8 | SSW | 100 | - | |
Tue | 1 | 23 | 13 | 1026 | 76 | 7 | 13 | NNW | 0 | - |
Hebgen Dam Frequently Asked Questions
Hebgen Dam is in Montana.
Hebgen Dam is in Gallatin County.
Hebgen Dam is 88 feet high.
Hebgen Dam is 721 feet long.
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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