US Bridges

US 4 over Indian River

Fair

Grafton County, New Hampshire · 5.7 MI from Enfield Tl · Structure no. 003601860007600

Built
1942
83 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
41 ft
2 main spans
Daily traffic
2,636
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Indian River is a concrete culvert carrying US 4 over Indian River in Grafton County, New Hampshire. It was built in 1942, so it is 83 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 2,636 vehicles a day, roughly 7% of them trucks, projected to reach 3,901 by 2043. The structure is 41 ft (12.5 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesUS 4
CrossesIndian River
Location5.7 MI from Enfield Tl
RouteU.S. Route 4
CountyGrafton County
StateNew Hampshire
Coordinates43.64526, -72.0083
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 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 evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating52.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length41 ft (12.5 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,636 (2023)
Projected traffic3,901 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 1942, making it 83 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 2,636 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 4 over Indian River?

The structure is 41 ft (12.5 m) long with a longest span of 20 ft (6.1 m).

Who owns US 4 over Indian River?

It is owned by the State Highway Agency.