Alleman Lake Dam dam
Alleman Lake Dam
Alleman Lake Dam, located in LaSalle, Illinois, along the TRIB VERMILION RIVER, is a privately owned structure primarily used for recreation purposes. Built in 1975, this earth dam stands at a height of 26 feet and stretches 1285 feet in length, providing a maximum storage capacity of 80 acre-feet of water. Despite its uncontrolled spillway and outlet gates, the dam has a low hazard potential and a moderate risk assessment rating, indicating a moderate level of risk associated with its operation.
Managed by the Illinois Department of Natural Resources (IDNR), Alleman Lake Dam is subject to state regulation, permitting, inspection, and enforcement. The dam's last inspection in 2011 revealed no available condition assessment, suggesting a need for updated evaluations to ensure its safety and functionality. While the dam's Emergency Action Plan (EAP) status and risk management measures are not specified, its risk assessment level of moderate highlights the importance of continued monitoring and maintenance to mitigate potential hazards and protect downstream communities.
With its scenic location and recreational purpose, Alleman Lake Dam serves as a popular spot for outdoor enthusiasts in the Lowell area. Although it is not operated by the US Army Corps of Engineers, the dam's position within the Rock Island District and its association with the TRIB VERMILION RIVER make it a key component of the local water resource and climate landscape, emphasizing the need for ongoing oversight and maintenance to ensure its long-term sustainability and safety.
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 Alleman Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Vermilion River Near Leonore | 487 cfs | → |
| Fox River At Dayton | 1,620 cfs | → |
| Illinois River At Marseilles | 6,260 cfs | → |
| Illinois River At Henry | 9,270 cfs | → |
| East Bureau Creek Near Bureau | 2 cfs | → |
| Big Bureau Creek At Princeton | 41 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Alleman Lake Dam.
Boat launches
- Ed Hand Highway 95, Deer Park
- Il 71 Lasalle County
- Courtney Street Ottawa
- Calumet Street Ottawa
- Il 89 Spring Valley
- East 2425th Road Lasalle County
Campgrounds
- Horseback Campground @ Matthiessen State Park
- Starved Rock State Park
- Illini State Park
- Illini State Park Campground
- Lake De Pue City Park
- Tony's Cabin
Fishing spots
Track Alleman 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 Alleman Lake Dam
Where does the data for Alleman 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 Alleman Lake Dam.