Dan Brown Dam Reservoir Report
Last Updated: December 21, 2025
Dan Brown Dam, located in Tazewell, Illinois, is a privately owned earth dam with a primary purpose of recreation.
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Summary
The dam, designed by MAURER-STUTZ, INC., stands at 30 feet high and spans 1694 feet in length, holding a normal storage capacity of 180 acre-feet. Situated on the TRIB MACKINAW R river, the dam is regulated by the Illinois Department of Natural Resources (IDNR) and is subject to state permitting, inspection, and enforcement.
Despite its low hazard potential, the dam poses a moderate risk, with a risk assessment rating of 3. The last inspection of the dam was conducted in April 2021, with a scheduled inspection frequency of every 5 years. While an emergency action plan (EAP) is not currently available, the dam's risk management measures and inundation maps status are unknown. With its scenic location and recreational amenities, the Dan Brown Dam serves as both a picturesque landmark and a potential focal point for climate and water resource enthusiasts to monitor and assess.
Dam Length |
1694 |
Dam Height |
30 |
River Or Stream |
TRIB MACKINAW R |
Primary Dam Type |
Earth |
Surface Area |
15 |
Drainage Area |
0.5 |
Nid Storage |
180 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Dan Brown Dam