US Bridges

US 4 over River Road Bmrr(abd)

Fair

Merrimack County, New Hampshire · 0.4MI from Concord Tl · Structure no. 002601390004000

Built
1958
67 years old, rebuilt 1992
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
244 ft
4 main spans
Daily traffic
15,071
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over River Road Bmrr(abd) is a steel stringer/multi-beam or girder carrying US 4 over River Road Bmrr(abd) in Merrimack County, New Hampshire. It was built in 1958 and reconstructed in 1992, so it is 67 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 15,071 vehicles a day, roughly 5% of them trucks, projected to reach 22,305 by 2043. The structure is 244 ft (74.4 m) long and 56 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesUS 4
CrossesRiver Road Bmrr(abd)
Location0.4MI from Concord Tl
RouteCity Street 0
CountyMerrimack County
StateNew Hampshire
Coordinates43.29076, -71.59258
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.8 US tons
Inventory rating53.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length244 ft (74.4 m)
Longest span65 ft (19.8 m)
Deck width56 ft (17.2 m)
Roadway width49 ft (14.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,071 (2023)
Projected traffic22,305 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 4 over River Road Bmrr(abd) built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1992.

What condition is US 4 over River Road Bmrr(abd) 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 June 2023.

How much traffic does US 4 over River Road Bmrr(abd) carry?

About 15,071 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 4 over River Road Bmrr(abd)?

The structure is 244 ft (74.4 m) long with a longest span of 65 ft (19.8 m) and a deck 56 ft wide.

Who owns US 4 over River Road Bmrr(abd)?

It is owned by the State Highway Agency.