Dovetail #1 Reservoir Report
Nearby: Torger Dam Clamhopper #1
Last Updated: December 5, 2025
Dovetail #1 is a privately owned earth dam located in Petroleum, Montana, with a primary purpose of providing fire protection, stock, or a small fish pond.
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Summary
Built in 1961 by the USDA NRCS, this dam stands at 20 feet high and spans 454 feet in length, with a storage capacity of 94 acre-feet. Situated on TR-Dovetail Creek, this structure is regulated by the DNRC and is under state jurisdiction, with permitting, inspection, and enforcement in place.
Despite its low hazard potential, Dovetail #1 has a moderate risk assessment rating of 3, indicating some potential issues that need to be managed. The dam features an uncontrolled spillway with a width of 65 feet and a maximum discharge of 430 cfs. While the condition of the dam has not been officially rated, it is reassuring to know that emergency action plans are in place. With its strategic location and multifaceted utility, Dovetail #1 serves as a valuable resource for water management and climate adaptation efforts in the region.
Year Completed |
1961 |
Dam Length |
454 |
Dam Height |
20 |
River Or Stream |
TR-DOVETAIL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
3.13 |
Nid Storage |
94 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Dovetail #1