Murphy Dam Road over Dam Spillway
PoorPosted for loadCoos County, New Hampshire · 0.2 MI from US Rt 3 · Structure no. 021000990003400
- Built
- 1938
- 87 years old
- Condition
- Poor
- inspected November 2024
- Type
- Girder and Floorbeam System
- Steel
- Length
- 38 ft
- 1 main span
- Daily traffic
- 96
- 2023 count
- Owner
- State
- Other State Agency
About this bridge
Murphy Dam Road over Dam Spillway is a steel girder and floorbeam system carrying Murphy Dam Road over Dam Spillway in Coos County, New Hampshire. It was built in 1938, so it is 87 years old, older than the New Hampshire average of 56.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 96 vehicles a day, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 38 ft (11.6 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Murphy Dam Road over Dam Spillway built?
It was built in 1938, making it 87 years old in 2025.
What condition is Murphy Dam Road over Dam Spillway in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.
How much traffic does Murphy Dam Road over Dam Spillway carry?
About 96 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Murphy Dam Road over Dam Spillway?
The structure is 38 ft (11.6 m) long with a longest span of 31 ft (9.4 m) and a deck 20 ft wide.
Who owns Murphy Dam Road over Dam Spillway?
It is owned by the Other State Agency.