Arrowwood Lake Dam dam
Arrowwood Lake Dam
Arrowwood Lake Dam, located in St. Clair County, Illinois, stands as a testament to innovative engineering and environmental stewardship. Completed in 2001, this private-owned dam primarily serves the purpose of recreation, offering a serene oasis for water resource and climate enthusiasts to enjoy. Designed by THOVENOT, WADE & MOERCHEN, this earth dam spans 900 feet in length and reaches a height of 28 feet, with a storage capacity of 297 acre-feet.
Despite its low hazard potential, Arrowwood Lake Dam is regulated and inspected by the Illinois Department of Natural Resources, ensuring the safety and integrity of the structure. With a spillway width of 54 feet and the ability to discharge up to 1930 cubic feet per second, the dam minimizes potential risks while maximizing the recreational benefits for the surrounding community. Although the condition assessment is currently marked as "Not Available," the dam's risk assessment is rated as moderate, highlighting the importance of ongoing monitoring and management measures.
As a vital component of the local ecosystem, Arrowwood Lake Dam not only provides recreational opportunities but also serves as a critical water resource for the region. With its strategic location on the West Fork of Richland Creek, this dam plays a crucial role in maintaining water levels and supporting the surrounding wildlife. As water resource and climate enthusiasts continue to appreciate the beauty and functionality of Arrowwood Lake Dam, it serves as a reminder of the intersection between human ingenuity and environmental conservation 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 Arrowwood Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Richland Creek Near Hecker | 120 cfs | → |
| Silver Creek Near Freeburg | 155 cfs | → |
| Kaskaskia River At New Athens | 7,150 cfs | → |
| Martigney Creek Near Arnold | 2 cfs | → |
| Gravois Creek Near Mehlville | 6 cfs | → |
| Mattese Creek Near Mattese | 4 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Arrowwood Lake Dam.
Boat launches
- Il 13 New Athens
- North 1st Street 2252, Fayetteville
- St Ellen Mine Trail O'Fallon
- Randolph County
- Davis Street Ferry Road East Carondelet
- Williamson Road Oakville
Campgrounds
- Scott Afb Military
- Horseshoe Lake Recreation Area
- Fort Kaskaskia State Park
- Randolph County State Conservation Area
Paddle runs
Track Arrowwood 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 Arrowwood Lake Dam
Where does the data for Arrowwood 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 Arrowwood Lake Dam.