Grantsville dam
Grantsville
Grantsville, a private-owned irrigation dam located in Tooele County, Utah, stands as a vital resource for the surrounding community. Completed in 1984, this Earth-type dam has a hydraulic height of 77 feet and a structural height of 82 feet, providing a storage capacity of 3,885 acre-feet for irrigation purposes. With a high hazard potential, the dam is regulated by the Utah Division of Water Rights, ensuring its safety through regular inspections and enforcement measures.
Situated along the So Willow and No Willow rivers, Grantsville plays a crucial role in managing water resources in the area, with a maximum discharge capacity of 159 cubic feet per second. Despite its satisfactory condition assessment, the dam's high hazard potential underscores the importance of emergency preparedness and risk management. While specifics on risk assessment and management measures are currently unavailable, the dam's compliance with state regulations and inspection protocols reinforces its role as a reliable water infrastructure asset in Tooele County.
Grantsville's significance as an irrigation dam is further highlighted by its normal storage capacity of 3,370 acre-feet and its contribution to the agricultural landscape of the region. As a private-owned structure under state jurisdiction, the dam's operation and maintenance are crucial for sustaining water availability for irrigation needs. With a history dating back to 1984, Grantsville continues to serve as a key component in water management efforts, showcasing the intersection of water resource management and climate resilience in the region.
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 Grantsville -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Willow Creek Near Grantsville | 5 cfs | → |
| West Canyon Creek Near Cedar Fort | 0 cfs | → |
| Faust Creek Near Vernon | · | → |
| Goggin Drain Near Magna Utah | 143 cfs | → |
| Little Cottonwood Creek @ Jordan River Nr Slc | 68 cfs | → |
| Surplus Canal @ Salt Lake City | 280 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grantsville.
Campgrounds
- Grantsville Reservoir
- Cottonwood Campground - Slrd
- Intake Campground
- Intake
- Boy Scout
- Boy Scout Campground
Fishing spots
- Mill Canyon Fishing Dock And Boardwalk
- Lake Lillian
- Lake Florence
- Echo Reservoir
- Lake Solitude
- Lake Desolation
Track Grantsville 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 Grantsville
Where does the data for Grantsville 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 Grantsville.