Maas Dam dam
Maas Dam
Maas Dam, located in Ellisville, Illinois, is a privately owned earth dam constructed in 1999 for recreation purposes. The dam stands at a height of 60 feet and spans 700 feet, with a storage capacity of 195 acre-feet. Situated on the TRIB LITTLE COAL CREEK, the dam serves as a recreational spot with a surface area of 7.9 acres and a maximum discharge capacity of 480 cubic feet per second.
Managed by the Illinois Department of Natural Resources (IDNR), Maas Dam is regulated, permitted, inspected, and enforced by the state agency to ensure compliance and safety. Despite its low hazard potential, the dam's risk assessment is moderate, indicating the need for ongoing risk management measures. While the condition assessment is not available, regular inspections are conducted every five years, with the last inspection taking place in April 2021.
With its scenic location and recreational opportunities, Maas Dam provides a valuable resource for water and climate enthusiasts in Fulton, Illinois. As a well-maintained earth dam with a controlled spillway, the dam offers a safe and enjoyable environment for visitors to appreciate the beauty of the surrounding area and engage in various water-based activities.
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 Maas Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Spoon River At London Mills | 441 cfs | → |
| Spoon River At Seville | 594 cfs | → |
| Illinois River At Kingston Mines | 12,400 cfs | → |
| Indian Creek Near Wyoming | 13 cfs | → |
| Mackinaw River Near Green Valley | 335 cfs | → |
| Fondulac Creek Near East Peoria | · | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Maas Dam.
Boat launches
- Lakeland Park Road 26005, Canton
- Sebree Road Fulton County
- Spring Lake Road Tazewell County
- West Jefferson Street 598, Havana
- Gatewood Lane Galesburg
- Mendenhall Park
Track Maas 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 Maas Dam
Where does the data for Maas 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 Maas Dam.