Lost Again Reservoir Report
Nearby: Jasper Br-12 Retention Dam
Last Updated: March 17, 2026
Lost Again is a privately owned dam located in Fort Belknap Agency, Montana, along TR-Fifteen Mile Creek.
Summary
Built in 1947 for fire protection, stock, and small fish pond purposes, this earth dam stands at a height of 25 feet and has a storage capacity of 35 acre-feet. While the dam is state-regulated by the DNRC and is regularly inspected, its hazard potential is rated as low and its condition assessment is currently not rated.
Despite its relatively low risk level, Lost Again serves as a vital resource for the surrounding area, providing essential water storage for fire protection and livestock. With its strategic location and historical significance, this dam is a prime example of sustainable water management practices in Montana. Water resource and climate enthusiasts will find Lost Again to be a fascinating case study in dam infrastructure and its role in supporting local communities and ecosystems.
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°F
mph
Wind
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Humidity
15-Day Weather Outlook
Year Completed |
1947 |
Dam Length |
150 |
Dam Height |
25 |
River Or Stream |
TR-FIFTEEN MILE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
35 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
Battle Creek Near Chinook Mt
|
45cfs |
Clear Creek Near Chinook Mt
|
21cfs |
Milk River Near Harlem Mt
|
146cfs |
Milk River At Havre Mt
|
30cfs |
Peoples Creek Near Hays Mt
|
4cfs |
Big Sandy Creek Near Havre Mt
|
6cfs |
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.
Lost Again