No. Decker Flood Control Reservoir No. 2 dam
No. Decker Flood Control Reservoir No. 2
No. Decker Flood Control Reservoir No. 2, located in Big Horn, Montana, is a private-owned dam regulated by the state's Department of Natural Resources and Conservation (DNRC). This reservoir, with a primary purpose of water supply, has a dam height of 52 feet and a storage capacity of 287.93 acre-feet. The dam's hazard potential is considered significant, with a fair condition assessment as of May 2012.
The reservoir, completed at an undisclosed date, falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers. It is primarily used for water supply purposes and has a maximum discharge capacity of 1243 cubic feet per second. Despite its moderate risk assessment rating, the dam has not undergone any modifications or significant risk management measures, according to the available data.
No. Decker Flood Control Reservoir No. 2 serves as a crucial water resource in the region, with its regulated operations ensuring the safety of surrounding communities. Its significant storage capacity and controlled spillway system contribute to flood control efforts, making it a vital asset for water management and climate resilience in the area.
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 No. Decker Flood Control Reservoir No. 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tongue River At Tongue R Dam Nr Decker Mt | 268 cfs | → |
| Tongue River At State Line Nr Decker Mt | 403 cfs | → |
| Prairie Dog Creek Near Acme | 19 cfs | → |
| Tongue River At Monarch | 383 cfs | → |
| Goose Creek Near Acme | 123 cfs | → |
| Rosebud C At Reservation Bndry Nr Kirby Mt | 6 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near No. Decker Flood Control Reservoir No. 2.
Campgrounds
- Tongue River Reservoir State Park
- Sheridan Koa
- Connor Battlefield State Park
- Washington Park - Sheridan
- Tongue River Camp - Amsden Creek Wma
- Tongue Canyon Campground
Fishing spots
- Sheridan Fairgrounds Pond
- Tongue River Fishing Site
- Lake Desmet
- Tongue River Fishing East
- Tongue River Fishing West
- Healy Lake
Paddle runs
- Bridge At Tongue River Canyon To Burgess Picnic Grounds
- Sf Tongue- Johnson Creek To Confluence With Nf Tongue
- Nf Tongue From Burgess Picnic Ground To Pole Creek
- Wagon Box Creek To Dry Fork Trail
- Dry Fork River From Its Confluence With Lake Creek To Confluence With Little Big Horn
- Fools Gold Crossing (Fdr 480) To Wagon Box Creek
Track No. Decker Flood Control Reservoir No. 2 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 No. Decker Flood Control Reservoir No. 2
Where does the data for No. Decker Flood Control Reservoir No. 2 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 Significant 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 No. Decker Flood Control Reservoir No. 2.