US Bridges

Fdr 15 over Trib. to Ammonoosuc

Fair

Coos County, New Hampshire · Map 02 · Structure no. 092202000001023

Built
1949
76 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
99
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 15 over Trib. to Ammonoosuc is a concrete slab carrying Fdr 15 over Trib. to Ammonoosuc in Coos County, New Hampshire. It was built in 1949, so it is 76 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 99 vehicles a day, projected to reach 148 by 2045. The structure is 23 ft (7 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesFdr 15
CrossesTrib. to Ammonoosuc
LocationMap 02
RouteFederal Lands Road 15
CountyCoos County
StateNew Hampshire
Coordinates44.44298, -71.30389
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width15 ft (4.6 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (—)
Projected traffic148 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 15 over Trib. to Ammonoosuc built?

It was built in 1949, making it 76 years old in 2025.

What condition is Fdr 15 over Trib. to Ammonoosuc 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 September 2023.

How much traffic does Fdr 15 over Trib. to Ammonoosuc carry?

About 99 vehicles per day (latest count).

How long is Fdr 15 over Trib. to Ammonoosuc?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 15 ft wide.

Who owns Fdr 15 over Trib. to Ammonoosuc?

It is owned by the U.S. Forest Service.