Windy Knoll Dam dam
Windy Knoll Dam
Windy Knoll Dam, located in Marthasville, Missouri, was completed in 1969 and serves as a recreational area along the Trib-Charrette Creek. The earth dam stands at 31 feet in height and spans 432 feet in length, with a storage capacity of 83 acre-feet. Despite its primary purpose for recreation, the dam is classified as having a high hazard potential.
The dam, owned privately, is not regulated by the state nor does it receive federal funding or oversight. Its last inspection dates back to June 1980, with a condition assessment of "Not Rated". While the dam lacks certain safety measures such as an Emergency Action Plan (EAP) and inundation maps, it remains a popular spot for outdoor enthusiasts in Warren County, Missouri.
With its serene setting and ample recreational opportunities, Windy Knoll Dam stands as a local landmark in the Marthasville area. However, the lack of recent inspections and safety measures raises concerns about its resilience in the face of potential hazards. For water resource and climate enthusiasts, this dam serves as a reminder of the importance of regular maintenance and proactive risk management in safeguarding our natural resources.
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 Windy Knoll Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cuivre River Near Troy | 1,170 cfs | → |
| Dardenne Creek At Ofallon | 185 cfs | → |
| Missouri River At Hermann | 133,000 cfs | → |
| Dardenne Creek At Old Town St. Peters | 389 cfs | → |
| Bourbeuse River At Union | 329 cfs | → |
| Bonhomme Creek Near Ellisville | 3 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Windy Knoll Dam.
Boat launches
- Katy Trail Warren County
- Brittany Place 1, Lake Saint Louis
- Buchheit Road 128, Franklin County
- Windjammer Point 200, Lake Saint Louis
- Downtown Washington
- Lakeside Trail Lincoln County
Campgrounds
- Camp Trinity
- Cuivre River State Park
- Klondike County Park
- Hermann City Rv Park
- Babler Memorial State Park
- St. Peters 370 Lakeside Park
Paddle runs
Track Windy Knoll 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 Windy Knoll Dam
Where does the data for Windy Knoll 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 Windy Knoll Dam.