Twin Lakes Lane South Lake Dam dam
Twin Lakes Lane South Lake Dam
Twin Lakes Lane South Lake Dam, also known as Dales Twin Lakes/South Lake, is a privately owned structure located in Mascoutah, Illinois. Built in 1966 by the USDA NRCS, this earth dam stands at a height of 31 feet and spans 174 feet in length. Its primary purpose is for recreational use, offering a serene setting for water resource and climate enthusiasts to enjoy.
Managed by the Illinois Department of Natural Resources, Twin Lakes Lane South Lake Dam is state regulated and inspected regularly to ensure its safety. With a low hazard potential and moderate risk assessment, this dam provides a controlled spillway system and uncontrolled outlet gates. The surrounding area, including the Trib Silver Creek, benefits from the 148-acre storage capacity and normal storage of 80 acres provided by this dam.
For those interested in water resource management and climate resilience, Twin Lakes Lane South Lake Dam offers an intriguing case study in privately owned infrastructure. With a history of construction dating back to the 1960s and ongoing state oversight, this dam serves as a vital asset for recreation and risk management in the Madison County area of Illinois. Its design by the USDA NRCS and the regulatory framework provided by the IDNR highlight the collaborative efforts necessary to maintain and safeguard our water resources in the face of changing climate conditions.
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 Twin Lakes Lane South Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cahokia Creek At Edwardsville | 500 cfs | → |
| Silver Creek Near Troy | 628 cfs | → |
| Judys Branch At Rte 157 At Glen Carbon | 0 cfs | → |
| Indian Creek At Wanda | 53 cfs | → |
| Watkins Creek At Bellefontaine Nbr | 1 cfs | → |
| Watkins Creek Near Bellefontaine Neighbors | 0 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Twin Lakes Lane South Lake Dam.
Boat launches
- Schiber Court Maryville
- Highland Park Road Highland
- Il 111 Pontoon Beach
- Lake Drive Pontoon Beach
- St Ellen Mine Trail O'Fallon
- Riverlands Way West Alton
Track Twin Lakes Lane South 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 Twin Lakes Lane South Lake Dam
Where does the data for Twin Lakes Lane South 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 Twin Lakes Lane South Lake Dam.