Lake Lancelot Dam dam
Lake Lancelot Dam
Lake Lancelot Dam, located in Mapleton-Offstream, Illinois, is a private dam with a primary purpose of recreation. Built in 1971 by ASSOCIATED ENGINEERS, INC., this earth dam stands at a height of 54 feet and has a length of 750 feet. With a storage capacity of 1271 acre-feet, the dam is situated on the TRIB WEST BRANCH LAMARSH CREEK, offering a surface area of 48 acres for water enthusiasts to enjoy.
Managed by the Illinois Department of Natural Resources, Lake Lancelot Dam has a spillway width of 23 feet and a maximum discharge capacity of 2315 cubic feet per second. The dam's hazard potential is classified as high, with a moderate risk assessment rating. Although the condition assessment is currently not available, the dam is regularly inspected by state authorities, with the last inspection conducted in May 2021.
For water resource and climate enthusiasts looking to explore a recreational water source in Peoria County, Illinois, Lake Lancelot Dam offers an opportunity to appreciate the beauty of nature while understanding the importance of dam safety and management. With its picturesque surroundings and significant storage capacity, this dam serves as a vital asset for both local residents and visitors seeking a peaceful retreat by the water.
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 Lake Lancelot Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Illinois River At Kingston Mines | 26,000 cfs | → |
| Fondulac Creek Near East Peoria | 2 cfs | → |
| Farm Creek At Farmdale | 13 cfs | → |
| Mackinaw River Near Green Valley | 452 cfs | → |
| Mackinaw River Near Congerville | 312 cfs | → |
| Indian Creek Near Wyoming | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Lancelot Dam.
Boat launches
- Mendenhall Park
- Spring Lake Road Tazewell County
- Sebree Road Fulton County
- Lakeland Park Road 26005, Canton
- West Pine Street 1, Chillicothe
- Lakeview Drive 1717, Eureka
Track Lake Lancelot 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 Lake Lancelot Dam
Where does the data for Lake Lancelot 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 Lake Lancelot Dam.