761 Lang dam
761 Lang
Located in Fallon, Montana, 761 Lang is a privately owned earth dam that serves multiple purposes including fire protection, stock watering, and small fish pond. Built in 1965 by the Natural Resources Conservation Service, this dam on Waterhole Creek has a height of 21 feet and a storage capacity of 127 acre-feet. With a low hazard potential and a moderate risk assessment, this structure is regulated, permitted, inspected, and enforced by the Montana Department of Natural Resources and Conservation.
The dam has a spillway width of 50 feet and a maximum discharge capacity of 500 cubic feet per second. Despite being uncontrolled, the dam's condition is currently not rated, and it has not been assessed for emergency action plans or inundation maps. With its primary purpose being fire protection, the dam plays a crucial role in ensuring water availability for various uses in the area. As a vital resource for the local community, monitoring and maintenance are key to ensuring its continued functionality and safety for both humans and wildlife.
The proximity to Marmarth, N.D., and the Congressional District 00 in Montana makes 761 Lang an important asset in the region's water resource management. As climate change continues to impact water availability and usage, structures like this earth dam become even more significant in maintaining a stable and sustainable water supply. With proper management and oversight, this dam will continue to play a crucial role in mitigating water-related challenges in the area for years to come.
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 761 Lang -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Little Missouri River At Marmarth | 4 cfs | → |
| Deep Creek Nr Amidon | 0 cfs | → |
| Little Missouri River At Medora | 43 cfs | → |
| Little Missouri R At Camp Crook Sd | 5 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near 761 Lang.
Campgrounds
Paddle runs
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Track 761 Lang 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 761 Lang
Where does the data for 761 Lang 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 761 Lang.