US Bridges

US 4 over Huppe Brook

Fair

Grafton County, New Hampshire · 0.08 Mi. from Enfield Tl · Structure no. 014402060012900

Built
1945
80 years old, rebuilt 1994
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
10,801
2023 count
Owner
State
State Highway Agency

About this bridge

US 4 over Huppe Brook is a prestressed concrete stringer/multi-beam or girder carrying US 4 over Huppe Brook in Grafton County, New Hampshire. It was built in 1945 and reconstructed in 1994, so it is 80 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 10,801 vehicles a day, roughly 7% of them trucks, projected to reach 15,985 by 2043. The structure is 24 ft (7.3 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesUS 4
CrossesHuppe Brook
Location0.08 Mi. from Enfield Tl
RouteU.S. Route 4
CountyGrafton County
StateNew Hampshire
Coordinates43.64882, -72.16976
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
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 rating81.5 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span21 ft (6.4 m)
Deck width32 ft (9.9 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,801 (2023)
Projected traffic15,985 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
Strategic Highway NetworkInterstate STRAHNET route

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 Huppe Brook built?

It was built in 1945, making it 80 years old in 2025. It was reconstructed in 1994.

What condition is US 4 over Huppe Brook 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 Huppe Brook carry?

About 10,801 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 4 over Huppe Brook?

The structure is 24 ft (7.3 m) long with a longest span of 21 ft (6.4 m) and a deck 32 ft wide.

Who owns US 4 over Huppe Brook?

It is owned by the State Highway Agency.