Agate Flat Dam dam
Agate Flat Dam
Agate Flat Dam, located in Prairie, Montana, is a gravity dam managed by the Bureau of Land Management. It stands at a hydraulic height of 27 feet and a structural height of 32 feet, with a length of 1331 feet. The dam has a storage capacity of 183.5 acre-feet, with a normal storage capacity of 41.96 acre-feet. While it has a low hazard potential, its condition assessment is rated as satisfactory.
The dam, constructed by the Bureau of Land Management, serves the primary purpose of water storage. It features an uncontrolled spillway with a width of 3 feet and is associated with an unnamed drainage. The risk assessment for Agate Flat Dam is moderate, indicating a need for ongoing monitoring and management measures. The last inspection took place in September 2018, with a scheduled inspection frequency of 5 years.
For water resource and climate enthusiasts, Agate Flat Dam presents an intriguing case study in dam management and risk assessment. Its location in Montana, along with its design features and storage capacity, make it a valuable asset for the management of water resources in the region. Continued monitoring and maintenance will be essential to ensure the dam's continued safety and functionality in the face of evolving 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 Agate Flat Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Redwater River At Circle Mt | 14 cfs | → |
| Yellowstone River At Glendive Mt | 9,690 cfs | → |
| Nelson Creek Near Van Norman Mt | 0 cfs | → |
| Yellowstone River At Miles City Mt | 10,600 cfs | → |
| Powder River Near Locate Mt | 17 cfs | → |
| Tongue River At Miles City Mt | 61 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Agate Flat Dam.
Track Agate Flat 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 Agate Flat Dam
Where does the data for Agate Flat 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 Agate Flat Dam.