Holland Pond Dam is an earth dam located in Jersey County, Illinois, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 31 ft31 ft tall and 180 ft long, taller than 72% of U.S. dams with a recorded height. 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 Holland Pond Dam
Holland Pond Dam is a dam in Jersey, Illinois. The dam is owned by John Holland (private). It impounds the Tr- Piasa Creek near Alton on Mississippi.
The dam stands 31 feet tall and stretches 180 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 38 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1963, the structure is well into its service life at over 50 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 08/27/2025.
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Location
| State | Illinois |
| County | Jersey |
| Nearest City | Alton on Mississippi |
| River/Stream | Tr- Piasa Creek |
| Coordinates | 39.03025, -90.23810 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 180 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 38 acre-ft |
| Max Storage | 38 acre-ft |
| Normal Storage | 26 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 291 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | John Holland |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL40049 |
| Federal ID | IL40049 |
| More Info | State Dam Safety Program |