Hollis Park Dam
High HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Illinois |
| County | Peoria |
| Nearest City | MAPLETON |
| River/Stream | TRIB LAMARSH CREEK |
| Coordinates | 40.57731, -89.74791 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 51 ft |
| Dam Height | 51 ft |
| Dam Length | 700 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 820 acre-ft |
| Max Storage | 820 acre-ft |
| Normal Storage | 335 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 534 sq mi |
| Max Discharge | 4,686 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | HOLLIS PARK DISTRICT |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 11/04/2025 |
| Emergency Action Plan | Yes |