Glen Elyn Upper Dam
Glen Elyn Upper Dam is an earth dam located in Harford County, Maryland, built in 1975. It carries a Significant hazard potential classification and has a fair condition assessment.
About Glen Elyn Upper Dam
The primary purpose of Glen Elyn Upper Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Glen Elyn Homeowners Association (private). It impounds the Little Gunpower Falls-tr near Fallston.
The dam stands 19 feet tall and stretches 230 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 23 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 09/19/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Maryland |
| County | Harford |
| Nearest City | Fallston |
| River/Stream | Little Gunpower Falls-tr |
| Coordinates | 39.54080, -76.50840 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 230 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 23 acre-ft |
| Max Storage | 23 acre-ft |
| Normal Storage | 3 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 516 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Glen Elyn Homeowners Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/19/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MD00450 |
| Federal ID | MD00450 |
| More Info | State Dam Safety Program |