US Bridges

US 4 over Indian River

Fair

Grafton County, New Hampshire · 4.9 Miles from Enfield Tl · Structure no. 003601690007300

Built
1978
47 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
1 main span
Daily traffic
6,096
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Indian River is a steel stringer/multi-beam or girder carrying US 4 over Indian River in Grafton County, New Hampshire. It was built in 1978, so it is 47 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 6,096 vehicles a day, roughly 7% of them trucks, projected to reach 9,022 by 2043. The structure is 95 ft (29 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 4
CrossesIndian River
Location4.9 Miles from Enfield Tl
RouteU.S. Route 4
CountyGrafton County
StateNew Hampshire
Coordinates43.64635, -72.02461
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.1 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span88 ft (26.8 m)
Deck width43 ft (13 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,096 (2023)
Projected traffic9,022 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway 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 US 4 over Indian River built?

It was built in 1978, making it 47 years old in 2025.

What condition is US 4 over Indian 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 May 2024.

How much traffic does US 4 over Indian River carry?

About 6,096 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 4 over Indian River?

The structure is 95 ft (29 m) long with a longest span of 88 ft (26.8 m) and a deck 43 ft wide.

Who owns US 4 over Indian River?

It is owned by the State Highway Agency.