Hemund dam
Hemund
Hemund, also known as Dogtown Sewer, is a private water resource structure located in Sappington, Montana. Completed in 1974, this earth dam serves primarily for irrigation purposes with a height of 20 feet and a storage capacity of 173 acre-feet. The dam is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is inspected, permitted, and enforced by state authorities to ensure its safety and compliance with regulations.
Situated in the Madison County of Montana, Hemund is a significant water resource with a hazard potential categorized as 'Significant'. Despite not having a formal condition assessment rating, the dam has not been modified or rated in recent years. With a maximum discharge capability of 300 cubic feet per second, Hemund plays a crucial role in managing water resources in the area and supporting irrigation activities. As a key infrastructure for water supply and management, Hemund is an essential component of the local water system and contributes to the sustainable use of water resources in the region.
Owned and operated privately, Hemund stands as an important irrigation structure in the area, providing vital water storage and management capabilities. With its strategic location and function in the Dogtown Sewer system, Hemund plays a crucial role in supporting agricultural activities and ensuring water availability for the community. As water resource and climate enthusiasts, understanding the significance of structures like Hemund is essential for promoting sustainable water practices and preserving the integrity of our natural resources for future generations.
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 Hemund -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Willow Creek Near Harrison Mt | 6 cfs | → |
| Jefferson River Near Three Forks Mt | 1,670 cfs | → |
| Madison River Bl Ennis Lake Nr Mcallister Mt | 1,140 cfs | → |
| Madison River Ab Powerplant Nr Mcallister Mt | 230 cfs | → |
| Gallatin River At Logan Mt | 756 cfs | → |
| Jefferson River Near Twin Bridges Mt | 1,770 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hemund.
Boat launches
- Us 287 Gallatin County
- Mt 359 Jefferson County
- Canaday Boat Launch
- Montana Highway 84 Madison County
- Warm Springs Day Use
- Mt 84 Gallatin County
Campgrounds
- Lewis And Clark Caverns State Park
- Lewis & Clark Caverns Campground
- Harrison Lake Fas
- Potosi Campground And Picnic Area
- Potosi
- Potosi Campground
Track Hemund 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 Hemund
Where does the data for Hemund 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 Hemund.