Mannix dam
Mannix
Mannix is a privately owned irrigation dam located in Helmville, Montana, along the Madison Gulch. Completed in 1962, this earth dam stands at a height of 30 feet and has a storage capacity of 53 acre-feet. Its primary purpose is irrigation, serving the agricultural needs of the region. Despite its age, Mannix has a low hazard potential and is currently not rated for its condition.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Mannix is regulated, permitted, inspected, and enforced by the state. The dam is situated in Powell County, within Congressional District 00 of Montana, represented by Greg Gianforte. The location of Mannix is at S3 12N 9W, with a latitude of 46.8167 and a longitude of -112.708. The dam is not part of the US Army Corps of Engineers (USACE) and has not been assessed for risk management measures.
With a focus on water resource and climate issues, enthusiasts will find Mannix to be an interesting case study in private dam ownership and state regulation. As a crucial piece of infrastructure for irrigation in the area, Mannix highlights the importance of proper maintenance and oversight to ensure the safety and effectiveness of water management systems. Its location in the scenic landscape of Montana adds to the significance of its role in sustainable water resource utilization.
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 Mannix -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Nevada Cr Ab Reservoir | 27 cfs | → |
| Blackfoot R Ab Nevada Cr Nr Helmville Mt | 765 cfs | → |
| Clark Fork At Goldcreek Mt | 380 cfs | → |
| Little Blackfoot River Near Garrison Mt | 153 cfs | → |
| Nf Blackfoot R Ab Dry Gulch Nr Ovando Mt | 824 cfs | → |
| Flint Creek Near Drummond Mt | 11 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mannix.
Campgrounds
- Hooper Park
- Moose Creek Campground (Free)
- Aspen Grove Campground
- Aspen Grove Group Use Campground
- Browns Lake Fas
- Copper Creek
Fishing spots
- Arrastra Creek
- Alice Creek
- River Junction Fishing Access
- Rattlesnake Creek
- Little Prickly Pear Creek
- Silver Creek
More reservoirs
Track Mannix 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 Mannix
Where does the data for Mannix 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 Mannix.