US Bridges

Fdr 15 over W.Br.Ammonoosuc River

Fair

Coos County, New Hampshire · Map 02 · Structure no. 092202000001026

Built
2005
20 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
46 ft
1 main span
Daily traffic
99
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 15 over W.Br.Ammonoosuc River is a wood or timber stringer/multi-beam or girder carrying Fdr 15 over W.Br.Ammonoosuc River in Coos County, New Hampshire. It was built in 2005, so it is 20 years old, younger 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 125 by 2045. The structure is 46 ft (14 m) long and 18 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesFdr 15
CrossesW.Br.Ammonoosuc River
LocationMap 02
RouteFederal Lands Road 15
CountyCoos County
StateNew Hampshire
Coordinates44.5011, -71.31537
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 protection7 GoodSome minor problems.
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width18 ft (5.6 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (—)
Projected traffic125 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 15 over W.Br.Ammonoosuc River built?

It was built in 2005, making it 20 years old in 2025.

What condition is Fdr 15 over W.Br.Ammonoosuc 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 September 2023.

How much traffic does Fdr 15 over W.Br.Ammonoosuc River carry?

About 99 vehicles per day (latest count).

How long is Fdr 15 over W.Br.Ammonoosuc River?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 18 ft wide.

Who owns Fdr 15 over W.Br.Ammonoosuc River?

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