Morrison Rockwood Siltation Pond Dam
Morrison Rockwood Siltation Pond Dam is an earth dam located in Whiteside County, Illinois, built in 1981. It carries a Low hazard potential classification.
About Morrison Rockwood Siltation Pond Dam
The primary purpose of Morrison Rockwood Siltation Pond Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Illinois Department Of Natural Resources (state). It impounds the Trib Rock Creek near Morrison.
The dam stands 29 feet tall and stretches 410 feet across, and has a maximum storage capacity of 140 acre-feet. Completed in 1981, the structure is 45 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 10/22/2025.
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Location
| State | Illinois |
| County | Whiteside |
| Nearest City | Morrison |
| River/Stream | Trib Rock Creek |
| Coordinates | 41.84695, -89.97312 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 410 ft |
| Year Completed | 1981 (45 years old) |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
| Normal Storage | 90 acre-ft |
| Max Discharge | 2,080 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | ILLINOIS DEPARTMENT OF NATURAL RESOURCES |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 10/22/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL50070 |
| Federal ID | IL50070 |
| More Info | State Dam Safety Program |