Posy Lake Dam
Posy Lake
Posy Lake, located in Garfield, Utah, is a picturesque water resource managed by the USDA Forest Service for recreational purposes. The lake is a small earth dam structure with a height of 15 feet and a maximum storage capacity of 50 acre-feet. With a surface area of 11 acres, Posy Lake offers visitors a tranquil escape surrounded by the natural beauty of the forest.
Despite its modest size, Posy Lake is regulated by the Utah Division of Water Rights, ensuring that it meets state standards for safety and environmental impact. The dam's low hazard potential and moderate risk assessment make it a relatively safe destination for outdoor enthusiasts looking to enjoy water-based activities in a serene setting. Visitors can appreciate the uncontrolled spillway and surrounding landscape, knowing that the Forest Service conducts regular inspections to maintain the lake's condition and ensure its continued accessibility.
For water resource and climate enthusiasts, Posy Lake provides a unique opportunity to explore a federally managed water source in the heart of Utah. With its easy access and well-maintained facilities, this hidden gem offers a peaceful retreat where visitors can appreciate the intersection of human intervention and natural beauty. Whether fishing, boating, or simply soaking in the scenic views, Posy Lake is a must-visit destination for those seeking a harmonious blend of recreation and conservation in the great outdoors.
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 Posy Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pine Creek Near Escalante | 0 cfs | → |
| Escalante River Near Escalante | 1 cfs | → |
| Fremont River Near Bicknell | 46 cfs | → |
| East Fork Sevier River Near Kingston | 61 cfs | → |
| Sevier River Near Kingston | 2 cfs | → |
| Sevier River At Hatch | 55 cfs | → |
About Posy Lake
Where does the data for Posy Lake 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 below 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.
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.