Morrison Rockwood Siltation Pond Dam Reservoir Report
Last Updated: December 13, 2025
The Morrison Rockwood Siltation Pond Dam, located in Whiteside County, Illinois, is a state-regulated structure designed for debris control on the TRIB ROCK CREEK.
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Summary
Completed in 1981, this earth dam stands at a height of 29 feet and spans 410 feet in length, with a maximum storage capacity of 140 acre-feet. Despite its uncontrolled spillway and outlet gates, the dam has a low hazard potential and a moderate risk assessment rating.
Owned and operated by the state with oversight from the Illinois Department of Natural Resources, the Morrison Rockwood Siltation Pond Dam serves a crucial role in managing water resources in the region. Although specific condition assessments are not available, inspections are conducted every five years to ensure the structure's integrity and safety. With its strategic location and purposeful design, this dam contributes to the overall environmental health and sustainability of the area.
For water resource and climate enthusiasts, the Morrison Rockwood Siltation Pond Dam offers a fascinating example of engineering ingenuity and environmental stewardship. As a key component in the management of debris and water flow on TRIB ROCK CREEK, this earth dam showcases the importance of maintaining and regulating such structures for the protection of surrounding communities and ecosystems. With a focus on risk assessment and hazard mitigation, the dam represents a harmonious balance between human intervention and natural processes, highlighting the complex interplay between water resources, infrastructure, and climate resilience.
Year Completed |
1981 |
Dam Length |
410 |
Dam Height |
29 |
River Or Stream |
TRIB ROCK CREEK |
Primary Dam Type |
Earth |
Nid Storage |
140 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rock River At Como
|
3350cfs |
Elkhorn Creek Near Penrose
|
44cfs |
Mississippi River At Clinton
|
25000cfs |
Rock River Near Joslin
|
4400cfs |
Green River Near Geneseo
|
185cfs |
Wapsipinicon River Near De Witt
|
559cfs |
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.
Morrison Rockwood Siltation Pond Dam
Lock Road Whiteside County