Duncan Lake Dam dam
Duncan Lake Dam
Duncan Lake Dam, located in Marthasville, Missouri, was completed in 1962 and serves as both a recreational spot and a vital resource for the surrounding area. The earth dam stands at a height of 38 feet and has a length of 350 feet, with a maximum storage capacity of 107 acre-feet. Despite being classified as a low hazard potential structure, the dam is regularly inspected and maintained to ensure its safety and functionality.
The dam is situated on TR-PEERS SLOUGH and is under the jurisdiction of the DAM AND RESERVOIR SAFETY PROGRAM in Missouri. With a drainage area of 41 square miles and a surface area of 8 acres, Duncan Lake Dam plays a crucial role in managing water resources and controlling the flow of water in the region. The dam's spillway type is uncontrolled, with a spillway width of 25 feet and a maximum discharge of 236 cubic feet per second.
Overall, Duncan Lake Dam is in satisfactory condition and poses a moderate risk, as indicated by the most recent risk assessment. While it does not have any associated locks or outlet gates, the dam is equipped to handle emergencies, although details on emergency action plans and risk management measures are not readily available. Water resource and climate enthusiasts can appreciate the importance of this structure in maintaining a balance between recreational use and water management in the area.
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 Duncan Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Missouri River At Hermann | 121,000 cfs | → |
| Bourbeuse River At Union | 353 cfs | → |
| Meramec River At Pacific | 1,300 cfs | → |
| Dardenne Creek At Ofallon | 22 cfs | → |
| Bonhomme Creek Near Ellisville | 1 cfs | → |
| Cuivre River Near Troy | 199 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Duncan Lake Dam.
Boat launches
- Buchheit Road 128, Franklin County
- Katy Trail Warren County
- Downtown Washington
- Wharf Street 200, Hermann
- Highway Uu Franklin County
- Stierberger Court Union
Campgrounds
- Camp Trinity
- Hermann City Rv Park
- Klondike County Park
- Robertsville State Park
- Babler Memorial State Park
- Backpack Camp 7
Paddle runs
Track Duncan 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 Duncan Lake Dam
Where does the data for Duncan 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 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 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 Duncan Lake Dam.