Dyan dam
Dyan
Located in Chouteau, Montana, the Dyan dam is a state-regulated structure with a primary purpose of fire protection, stock, or small fish pond. Built in 1948, this earth dam stands at a height of 20 feet and has a storage capacity of 93 acre-feet. The dam is situated on the TR-SPRING COULEE river or stream, approximately 7 miles from the city of VIRGELLE.
Operated by the Montana Department of Natural Resources and Conservation (DNRC), Dyan has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam's emergency action plan (EAP) status and risk assessment details are currently not available, indicating a need for further information on the structure's safety and management measures. With its strategic location and key role in water resource management, Dyan serves as a vital asset for fire protection and livestock farming in the region.
Despite its age, Dyan continues to play a crucial role in water resource management in Montana, under the oversight of state regulators and inspection agencies. As an essential component of the local infrastructure, the dam's condition and safety standards are paramount to ensuring the protection of surrounding communities and ecosystems. With ongoing monitoring and potential risk assessment improvements, Dyan stands as a testament to the importance of sustainable water resource management in the face of changing climate conditions.
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 Dyan -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Missouri River At Virgelle Mt | 7,010 cfs | → |
| Teton River At Loma Mt | 26 cfs | → |
| Marias River Near Loma Mt | 504 cfs | → |
| Missouri River At Fort Benton Mt | 6,420 cfs | → |
| Marias River Near Chester Mt | 604 cfs | → |
| Big Sandy Creek Near Havre Mt | 4 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Dyan.
Boat launches
- Coal Banks Landing
- Little Sandy Coulee Rec Site
- Lone Tree Coulee
- Wood Bottom Recreation Area
- Seineurs Reach
- Monroe Island
Campgrounds
- Coal Banks Landing
- Little Sandy Coulee Rec Site
- Black Bluff Rapids
- Lone Tree Coulee
- Wood Bottom Recreation Area
- Wood Bottom Recreation Area - Umrbnm
Fishing spots
More reservoirs
Track Dyan 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 Dyan
Where does the data for Dyan 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 Dyan.