Stillwater Hertzler Tailings Dam dam
Stillwater Hertzler Tailings Dam
The Stillwater Hertzler Tailings Dam in Stillwater, Montana, is a privately owned structure regulated by the state's Department of Environmental Quality. This dam, with a storage capacity of 460 acre-feet, primarily serves the purpose of managing tailings from mining operations in the area. Despite its high hazard potential, the dam is currently in satisfactory condition, as assessed in June 2018, with regular inspections conducted every 5 years.
Located in Congressional District 00, Montana, this tailings dam is under the jurisdiction of the Mine Safety and Health Administration for regulatory oversight and inspections. The dam's emergency action plan was last revised in March 2016, and there are no inundation maps or risk assessments publicly available for this structure. With a surface area of 532 acres and normal storage capacity of 153 acre-feet, the Stillwater Hertzler Tailings Dam plays a crucial role in managing mining waste in the region while adhering to state permitting and inspection requirements.
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 Stillwater Hertzler Tailings Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| West Rosebud Creek Near Roscoe Mt | 77 cfs | → |
| Stillwater River Near Absarokee Mt | 1,020 cfs | → |
| Red Lodge Cr Ab Cooney Re Nr Boyd Mt | 22 cfs | → |
| Willow Creek Near Boyd Mt | 6 cfs | → |
| Boulder River At Big Timber Mt | 1,240 cfs | → |
| Soda Butte Cr At Park Bndry At Silver Gate | 280 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Stillwater Hertzler Tailings Dam.
⚓ Boat launches
- West Frontage Road Stillwater County
- Greycliff Bridge Sweet Grass County
- North Yellowstone Trail Road Sweet Grass County
- Howie Road Sweet Grass County
⛺ Campgrounds
More campgrounds →🎣 Fishing spots
More fishing →Track Stillwater Hertzler Tailings 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 Stillwater Hertzler Tailings Dam
Where does the data for Stillwater Hertzler Tailings 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 High 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 Stillwater Hertzler Tailings Dam.