Holter Dam Quick Facts
Holter Dam Map
Holter Dam Information
Holter Dam is a gravity dam located about 8 miles from Craig, Mt, Lewis and Clark, Montana.
The dam, which is on the Missouri River, was primarily built for Hydroelectric purposes, but also serves for Flood Risk Reduction benefits.
The dam was designed by and commissioned in 1918 and is currently owned by NorthWestern Energy.
Holter Dam Structure
The Holter Dam is approximately 1,364 feet (416 m) long, 124 feet (38 m) high and has a structural volume of cubic yards (0 cubic metres).
Holter Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 245,000 acre-ft (302,203 Ml) and maximum capacity of 306,000 acre-ft (377,445 Ml).
The surface area of the reservoir is 4,550 acres (1,841 ha) and the total catchment area is 17,150 square miles (44,418 square kilometres).
Holter Dam Spillway
The dam has a 558 feet (170 m) wide controlled spillway with a maximum discharge capacity of 110000 cubic feet per second (3115 cubic metres per second).
Holter Dam Compared to Five Famous American Dams
Holter Dam Weather
Current Conditions at Holter Dam
Failed to fetch current weather data.7-Day Forecast for Holter Dam
Failed to fetch weather forecast data.Holter Dam Frequently Asked Questions
Holter Dam is in Montana.
Holter Dam is in Lewis and Clark County.
Holter Dam is 124 feet high.
Holter Dam is 1,364 feet long.
More Dams in Lewis and Clark County:
Canyon Ferry DamHauser Dam
Helena Valley Dam
Holter Dam
Nilan East Dam
Nilan North Dam
Willow Creek Bor Mt Dam
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Ackley Lake DamAshley Dam
Bair Dam
Beaver Creek Reservoir Dam
Box Elder Creek Dam
Broadwater Dam
Bullhook Dam
Bynum Reservoir Dam
Canyon Ferry Dam
Chinook, North Dam
Clark Canyon Dam
Cochrane Dam
Como Dam
Cooney Dam
Deadmans Basin Dam
Deadmans Basin Dike
Delmoe Lake Dam
Dry Fork Dam
East Fork Dam
Eureka Reservoir Dam
Eureka Reservoir West Dike
Frenchman Dam
Fresno Dam
Georgetown Dam
Gibson Dam
Hauser Dam
Hebgen Dam
Helena Valley Dam
Holter Dam
Homestead Dam
Hungry Horse Dam
Katy's Lake Dam
Kicking Horse Dam
Lake Frances East Dam
Lake Frances North Dam
Lake Sherburne Dam
Lima Dam
Lower Glasston Dam
Lower Willow Creek Dam
Madison Dam
Martinsdale, East Dam
Martinsdale, North Dam
Mccarter North Dam
Mccarter West Dam
Medicine Lake Dam No. 10
Medicine Lake Dam No. 11
Medicine Lake Dam No. 4
Morony Dam
Mystic Lake Dam
Nelson Dike Da
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