Hermit Hollow Lake Dam dam
Hermit Hollow Lake Dam
Hermit Hollow Lake Dam, located in St. Charles, Missouri, is a private earth dam completed in 1962 with a primary purpose of recreation. The dam stands at a height of 33 feet and has a storage capacity of 159 acre-feet, providing water for various recreational activities on the 9-acre surface area of the lake. Despite being privately owned, the dam is not regulated or inspected by the state, posing a high hazard potential due to its condition assessment being "Not Rated."
Although the dam has not been inspected since 1979 and lacks an Emergency Action Plan (EAP), it remains a popular spot for water resource and climate enthusiasts to enjoy the natural beauty of Lartto Creek. With a drainage area of 249 acres, the dam plays a crucial role in managing water flow and storage for the surrounding region. However, the lack of recent inspections and updated emergency protocols raise concerns about the safety and resilience of Hermit Hollow Lake Dam in the face of potential climate-related challenges.
As a recreational site nestled in the heart of Franklin County, Missouri, Hermit Hollow Lake Dam serves as a reminder of the delicate balance between human enjoyment of water resources and the importance of responsible management and maintenance. Enthusiasts drawn to this picturesque location should be mindful of the dam's high hazard potential and the need for ongoing monitoring and risk assessment to ensure the safety and sustainability of this beloved water feature 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 Hermit Hollow Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Meramec River At Pacific | 1,250 cfs | → |
| Bonhomme Creek Near Ellisville | 2 cfs | → |
| Bourbeuse River At Union | 311 cfs | → |
| Meramec River Near Eureka | 1,900 cfs | → |
| Big River At Byrnesville | 377 cfs | → |
| Bonhomme Creek Near Clarkson Valley | 6 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hermit Hollow Lake Dam.
Boat launches
- Katy Trail 1800, Saint Charles County
- Downtown Washington
- Stierberger Court Union
- Highway Uu Franklin County
- Grand Glaize Pkwy 1084, Valley Park
- Scott A Lewis Lane Cottleville
Campgrounds
- Klondike County Park
- Robertsville State Park
- Babler Memorial State Park
- Camp Trinity
- St. Peters 370 Lakeside Park
- Backpack Camp 7
Paddle runs
Track Hermit Hollow Lake Dam 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 Hermit Hollow Lake Dam
Where does the data for Hermit Hollow Lake Dam 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 Hermit Hollow Lake Dam.