US Bridges

US 4 over Indian River

Fair

Grafton County, New Hampshire · 4.7 MI from Enfield Tl · Structure no. 003601650007000

Built
1930
95 years old
Condition
Fair
inspected May 2024
Type
Frame
Concrete
Length
48 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 concrete frame carrying US 4 over Indian River in Grafton County, New Hampshire. It was built in 1930, so it is 95 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.

It carries about 6,096 vehicles a day, roughly 7% of them trucks, projected to reach 9,022 by 2043. The structure is 48 ft (14.6 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 4
CrossesIndian River
Location4.7 MI from Enfield Tl
RouteU.S. Route 4
CountyGrafton County
StateNew Hampshire
Coordinates43.64672, -72.02764
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating23 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length48 ft (14.6 m)
Longest span40 ft (12.2 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.8 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 1930, making it 95 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 48 ft (14.6 m) long with a longest span of 40 ft (12.2 m) and a deck 29 ft wide.

Who owns US 4 over Indian River?

It is owned by the State Highway Agency.