Lake Glenn Shoals Dam dam
Lake Glenn Shoals Dam
Lake Glenn Shoals Dam, located in Montgomery County, Illinois, is a vital structure managed by the local government for flood risk reduction and water supply purposes. Built in 1978 by HURST-ROSCHE, this earth dam stands at a height of 56 feet and spans 1430 feet along the Middle Fork of Shoal Creek. The dam has a storage capacity of 38,900 acre-feet, with a maximum discharge rate of 20,800 cubic feet per second.
The dam's spillway, with a width of 362 feet, is uncontrolled, posing a significant hazard potential. Although its condition assessment is currently unavailable, the dam is inspected every three years to ensure its structural integrity. With a moderate risk rating, the dam is regulated by the Illinois Department of Natural Resources and has been designed for efficient flood risk management. Lake Glenn Shoals Dam serves as a critical infrastructure in safeguarding the local community against flood events and ensuring a stable water supply for the region.
Managed by the St. Louis District of the US Army Corps of Engineers, Lake Glenn Shoals Dam plays a crucial role in the overall water resource management of the area. Despite its age, the dam continues to fulfill its primary purpose of flood risk reduction, highlighting its importance in the region's climate resilience efforts. Climate enthusiasts and water resource professionals alike can appreciate the strategic design and operational capabilities of this essential infrastructure in maintaining the balance between flood protection and sustainable water supply management.
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 Glenn Shoals Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| East Fork Shoal Creek Near Coffeen | 27 cfs | → |
| Hurricane Creek Near Mulberry Grove | 56 cfs | → |
| Kaskaskia River At Vandalia | 2,070 cfs | → |
| Shoal Creek Nr Pierron | 274 cfs | → |
| Hickory Creek Nr Brownstown | 35 cfs | → |
| Kaskaskia River Near Cowden | 1,580 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Glenn Shoals Dam.
Track Lake Glenn Shoals 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 Glenn Shoals Dam
Where does the data for Lake Glenn Shoals 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 Significant 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 Glenn Shoals Dam.