Pr-156 Retention Dam dam
Pr-156 Retention Dam
Pr-156 Retention Dam, located in Hinsdale, Montana, along the Whitewater Creek/Milk River, is a federal-owned structure under the jurisdiction of the Bureau of Land Management. Completed in 1937, this gravity dam serves the primary purpose of flood risk reduction, with a hydraulic height of 16 feet and a structural height of 20 feet. The dam has a storage capacity of 79 acre-feet and covers a surface area of 16 acres, helping to protect the surrounding area from potential flooding events.
Despite being labeled as low hazard potential and not yet rated for condition assessment, Pr-156 Retention Dam plays a crucial role in mitigating flood risks in the region. Operated and maintained by the Bureau of Land Management, the dam stands as a testament to effective water resource management and climate resilience efforts. With a drainage area of 0.3 square miles, the dam is strategically positioned to safeguard the local community and environment from potential water-related hazards.
As enthusiasts of water resources and climate resilience, the Pr-156 Retention Dam serves as a model for effective flood risk reduction infrastructure. With its well-defined purpose, strong design features, and historical significance, this gravity dam showcases the importance of proactive measures in safeguarding communities against the impacts of extreme weather events. The ongoing efforts by the Bureau of Land Management to operate and maintain this vital structure underscore the commitment to water resource management and climate adaptation in the region.
Dam data reference
Condition Assessment
- 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.
- 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.
- 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.
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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Pr-156 Retention Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Rock Cr Bl Horse Cr Nr Int Bndry | 5 cfs | → |
| Milk River At Juneberg Bridge Nr Saco Mt | 178 cfs | → |
| Beaver Creek Near Hinsdale Mt | 31 cfs | → |
| Beaver Cr Bl Guston Coulee Nr Saco Mt | 67 cfs | → |
| Milk River At Malta Mt | 31 cfs | → |
| Milk River Near Dodson Mt | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Pr-156 Retention Dam.
Track Pr-156 Retention Dam in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Pr-156 Retention Dam
Where does the data for Pr-156 Retention Dam come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Pr-156 Retention Dam.