US Bridges

Seven Islands Br over Androscoggin River

Fair

Coos County, New Hampshire · Adjacent to Errol 071/030 · Structure no. 008000740003000

Built
1951
74 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
169 ft
3 main spans
Daily traffic
—
2000 count
Owner
State
State Park, Forest, or Reservation Agency

About this bridge

Seven Islands Br over Androscoggin River is a steel stringer/multi-beam or girder carrying Seven Islands Br over Androscoggin River in Coos County, New Hampshire. It was built in 1951, so it is 74 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 fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

No traffic count is recorded. The structure is 169 ft (51.4 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSeven Islands Br
CrossesAndroscoggin River
LocationAdjacent to Errol 071/030
CountyCoos County
StateNew Hampshire
Coordinates44.71468, -71.17339
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans3
Design loadUnknown
Structure length169 ft (51.4 m)
Longest span77 ft (23.5 m)
Deck width12 ft (3.7 m)
Roadway width11 ft (3.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic—
Projected traffic—
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Park, Forest, or Reservation Agency
Maintained byState Park, Forest, or Reservation Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$314,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Seven Islands Br over Androscoggin River built?

It was built in 1951, making it 74 years old in 2025.

What condition is Seven Islands Br over Androscoggin River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does Seven Islands Br over Androscoggin River carry?

No traffic count is recorded for this structure.

How long is Seven Islands Br over Androscoggin River?

The structure is 169 ft (51.4 m) long with a longest span of 77 ft (23.5 m) and a deck 12 ft wide.

Who owns Seven Islands Br over Androscoggin River?

It is owned by the State Park, Forest, or Reservation Agency.