Hansen dam
Hansen
Hansen is a privately owned earth dam located in Montana, specifically in Roosevelt County near the city of NOHLY. Built in 1940 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, and small fish pond. It has a dam height of 15 feet and a length of 100 feet, providing a storage capacity of 92 acre-feet. The dam is regulated by the DNRC and is inspected, permitted, and enforced by the state, ensuring its safety and compliance with regulations.
Situated on TR-SHOTGUN CREEK, Hansen plays a crucial role in water resource management in the region, with a drainage area of 0.47 square miles. Despite its low hazard potential, the dam has not been rated for its condition assessment. While it lacks certain emergency preparedness measures such as an EAP and inundation maps, Hansen continues to provide essential services for the community, especially in terms of fire protection and water storage. With its historical significance and functional design, Hansen remains a key structure in the water infrastructure of Montana.
Managed by the Natural Resources Conservation Service, Hansen exemplifies the importance of earth dams in maintaining water resources for various purposes. As climate change impacts water availability and quality, structures like Hansen become increasingly vital for local communities. With its strategic location and state jurisdiction, Hansen stands as a testament to effective water management practices in the face of evolving environmental challenges.
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 Hansen -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Missouri River Near Culbertson Mt | 5,080 cfs | → |
| Big Muddy Cr Nr Mouth Nr Culbertson Mt | 11 cfs | → |
| Big Muddy Creek Near Antelope Mt | 11 cfs | → |
| Charbonneau Creek Nr Charbonneau | 0 cfs | → |
| Little Muddy River Bl Cow Creek Nr Williston | 17 cfs | → |
| Yellowstone River Near Sidney Mt | 13,400 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hansen.
Track Hansen 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 Hansen
Where does the data for Hansen 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 Hansen.