Frog Hollow dam
Frog Hollow
Frog Hollow, a privately owned earth dam located in Hurricane, Utah, was designed by the USDA NRCS and completed in 1978 for the primary purpose of flood risk reduction along the Frog Hollow river or stream. The dam stands at a hydraulic height of 51 feet and a structural height of 58 feet, with a total length of 1982 feet. Its storage capacity is 2000 acre-feet, with a normal storage level of 1450 acre-feet, serving a drainage area of 12.5 square miles.
However, despite its critical role in flood risk mitigation, Frog Hollow Dam is currently assessed as having a high hazard potential and poor condition. The Utah Division of Water Rights oversees its regulation, inspection, and enforcement, with the last inspection conducted in May 2019. The dam's emergency action plan status, risk assessment, and management measures are yet to be fully developed or updated, raising concerns about its ability to withstand potential emergencies or disasters.
For water resource and climate enthusiasts, Frog Hollow represents a crucial infrastructure in the management of water resources and flood protection in the region. Its current condition highlights the importance of regular maintenance, monitoring, and updating of emergency preparedness plans to ensure the safety and integrity of the dam and surrounding areas in the face of changing climate patterns and increasing water-related risks.
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 Frog Hollow -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Virgin River Ab La Verkin Creek Nr La Verkin | 31 cfs | → |
| Virgin River At Virgin | 88 cfs | → |
| Virgin River Ab Quail Creek Near Hurricane | 41 cfs | → |
| Virgin River Near Hurricane | 48 cfs | → |
| Leeds Creek Near Leeds | 7 cfs | → |
| Fort Pearce Wash Near St. George | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Frog Hollow.
Track Frog Hollow 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 Frog Hollow
Where does the data for Frog Hollow 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 Frog Hollow.