Grumpy dam
Grumpy
Grumpy is a privately owned earth dam located in Carter, Montana, near Marmouth South Dakota. Built in 1961 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 20 feet and a length of 300 feet, Grumpy has a storage capacity of 275 acre-feet and a drainage area of 0.88 square miles. It is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected and enforced by the state regularly to ensure its safety and compliance with regulations.
Situated on TR-Indian Creek, Grumpy has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. Despite not having a condition assessment date, the dam is monitored for any potential risks and has emergency action plans in place. The dam's spillway width is 20 feet, and it has a maximum discharge capacity of 200 cubic feet per second. Grumpy's location in a critical area for water resource management and climate resilience highlights its significance in providing essential services for the surrounding community and ecosystem.
Overall, Grumpy stands as a vital infrastructure for fire protection, livestock management, and environmental conservation in the region. Its construction and maintenance are overseen by the USDA NRCS, ensuring that it continues to serve its purposes effectively while adhering to state regulations and safety standards. As a key component of the local water resource system, Grumpy plays a crucial role in mitigating potential risks and enhancing the resilience of the surrounding area to climate-related 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 Grumpy -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Belle Fourche R At Wy-Sd State Line | 45 cfs | → |
| Little Missouri R At Camp Crook Sd | 14 cfs | → |
| Belle Fourche River Near Alva | 14 cfs | → |
| Inlet Canal Above Belle Fourche Reservoir Sd | 101 cfs | → |
| Redwater River Above Belle Fourche Sd | 89 cfs | → |
| Belle Fourche R Near Fruitdale Sd | 22 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grumpy.
More reservoirs
Track Grumpy 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 Grumpy
Where does the data for Grumpy 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 Grumpy.