Morrison Rockwood Siltation Pond Dam

TRIB ROCK CREEK· Whiteside, Illinois· Built 1981· Earth· 29 ft tall

Low Hazard Debris Control State Government

Key Takeaway

Morrison Rockwood Siltation Pond Dam is classified as low hazard in Illinois. It was completed in 1981 and is 45 years old. Its primary use is debris control.

Physical Details

Dam Height	29 ft (taller than 58.2% in IL)
Dam Length	410 ft
Dam Type	Earth
Max Storage	140 acre-ft
Normal Storage	90 acre-ft

Max Discharge	2,080 cfs
Year Completed	1981 (45 years old)
NID ID	IL50070

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: No

Last Inspection: May 3, 2023

State Regulated: Yes

Regulatory Agency: IDNR

Ownership

ILLINOIS DEPARTMENT OF NATURAL RESOURCES

State Government

Nearby Dams

Morrison Wwtp Excess Flow Storage Pond Dam

Whiteside, IL

Significant Hazard 8 ft

Mississippi River Lock and Dam 13

Whiteside, IA

Significant Hazard

Frequently Asked Questions

What is the hazard classification of Morrison Rockwood Siltation Pond Dam?

Morrison Rockwood Siltation Pond Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Morrison Rockwood Siltation Pond Dam?

Morrison Rockwood Siltation Pond Dam is owned by ILLINOIS DEPARTMENT OF NATURAL RESOURCES (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Morrison Rockwood Siltation Pond Dam built?

Morrison Rockwood Siltation Pond Dam was completed in 1981, making it 45 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Morrison Rockwood Siltation Pond Dam?

Morrison Rockwood Siltation Pond Dam serves the following purposes: Debris Control. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Morrison Rockwood Siltation Pond Dam?

Morrison Rockwood Siltation Pond Dam has a dam height of 29 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Morrison Rockwood Siltation Pond Dam last inspected?

Morrison Rockwood Siltation Pond Dam was last inspected on May 3, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.