Summary
Constructed in 1964 by the USDA NRCS, this Earth-type dam stands at a height of 10 feet and has a storage capacity of 54 acre-feet. With a low hazard potential and a condition assessment of "Not Rated," the dam serves primarily for irrigation purposes in the region.
Situated in Powell County, Montana, Manley #1 is regulated by the DNRC and undergoes state permitting, inspection, and enforcement. The dam has a maximum discharge of 950 cfs and a spillway width of 90 feet. Despite not having a condition rating, the dam's emergency action plan (EAP) status is undisclosed, and no risk assessment or management measures have been reported.
Water resource and climate enthusiasts interested in the infrastructure and management of dams will find Manley #1 intriguing for its historical significance and contribution to irrigation in the area. With its location in the scenic Montana landscape and its role in water conservation, this dam serves as a vital resource for the local community and highlights the importance of sustainable water management practices.
Year Completed |
1964 |
Dam Length |
100 |
Dam Height |
10 |
River Or Stream |
DOUGLAS CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Drainage Area |
16.2 |
Nid Storage |
54 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Clark Fork Near Drummond Mt
|
459cfs |
Flint Creek Near Drummond Mt
|
109cfs |
Blackfoot R Ab Nevada Cr Nr Helmville Mt
|
145cfs |
Nf Blackfoot R Ab Dry Gulch Nr Ovando Mt
|
101cfs |
Clark Fork At Goldcreek Mt
|
248cfs |
Nevada Cr Ab Reservoir
|
27cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Manley #1