Threw Lake Dam dam
Threw Lake Dam
Threw Lake Dam in Knox, Illinois, is a privately owned structure designed by Hanson Professional Services. The dam, with a height of 43 feet and a length of 700 feet, serves primarily for recreation, offering a storage capacity of 755 acre-feet and covering a surface area of 13 acres. Located on the TRIB NORTH FORK KICKAPOO CR stream, the dam is regulated by the Illinois Department of Natural Resources and is subject to state inspection and enforcement.
Despite being classified as having low hazard potential, Threw Lake Dam poses a moderate risk, with a moderate risk assessment score of 3. The dam features an uncontrolled spillway with a width of 4 feet and has no outlet gates. The last inspection was conducted in September 2018, with a scheduled inspection frequency of 5 years. While the condition assessment is currently not available, the dam's emergency action plan status, inundation maps, and risk management measures are also unspecified.
Water resource and climate enthusiasts will find Threw Lake Dam's structure and function intriguing, as it combines recreational value with considerations for safety and risk assessment. As a privately owned facility in Illinois, the dam's design and regulatory oversight by the state underscore the importance of proper management and maintenance to ensure its continued operation and safety for both recreational users and the surrounding environment. Further monitoring and assessment of the dam's condition and risk profile will be essential for sustainable water resource management in the region.
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 Threw Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Spoon River At London Mills | 441 cfs | → |
| Illinois River At Kingston Mines | 12,400 cfs | → |
| Indian Creek Near Wyoming | 13 cfs | → |
| Fondulac Creek Near East Peoria | · | → |
| Spoon River At Seville | 594 cfs | → |
| Farm Creek At Farmdale | 9 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Threw Lake Dam.
Boat launches
- Sebree Road Fulton County
- Lakeland Park Road 26005, Canton
- Spring Lake Road Tazewell County
- Mendenhall Park
- Gatewood Lane Galesburg
- West Jefferson Street 598, Havana
Track Threw 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 Threw Lake Dam
Where does the data for Threw 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 Threw Lake Dam.