Apthorp
Significant HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | New Hampshire |
| County | Grafton |
| Nearest City | Littleton |
| River/Stream | Ammonoosuc River |
| Coordinates | 44.30620, -71.74540 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 235 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 210 acre-ft |
| Max Storage | 210 acre-ft |
| Normal Storage | 210 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 205 sq mi |
| Max Discharge | 14,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | White Mountain Hydroelectric Corporation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/17/2022 |
| Emergency Action Plan | Yes |