Monroe Street Dam is an earth dam located in Macon County, Illinois, built in 1991. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 610 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Monroe Street Dam
The primary purpose of Monroe Street Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by City of Decatur (local government). It impounds the Trib Spring Creek near Decatur.
The dam stands 16 feet tall and stretches 610 feet across, has a maximum storage capacity of 182 acre-feet, and collects water from a drainage area of 26 square miles. Completed in 1991, the structure is 35 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 05/03/2023.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Macon |
| Nearest City | Decatur |
| River/Stream | Trib Spring Creek |
| Coordinates | 39.87252, -88.96344 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 610 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 182 acre-ft |
| Max Storage | 182 acre-ft |
| Drainage Area | 26 sq mi |
| Max Discharge | 4,400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | City of Decatur |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/03/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50091 |
| Federal ID | IL50091 |
| More Info | State Dam Safety Program |