US Bridges

US 3 Nh 11 over Mile Hill Road

Fair

Belknap County, New Hampshire · 0.5 MI from Belmont T.L. · Structure no. 013901210002800

Built
1967
58 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
8,856
2023 count
Owner
State
State Highway Agency

About this bridge

US 3 Nh 11 over Mile Hill Road is a prestressed concrete stringer/multi-beam or girder carrying US 3 Nh 11 over Mile Hill Road in Belknap County, New Hampshire. It was built in 1967, so it is 58 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 8,856 vehicles a day, roughly 7% of them trucks, projected to reach 13,106 by 2043. The structure is 66 ft (20.1 m) long and 50 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesUS 3 Nh 11
CrossesMile Hill Road
Location0.5 MI from Belmont T.L.
RouteU.S. Route 3
CountyBelknap County
StateNew Hampshire
Coordinates43.51375, -71.46885
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating33.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span61 ft (18.6 m)
Deck width50 ft (15.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,856 (2023)
Projected traffic13,106 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 3 Nh 11 over Mile Hill Road built?

It was built in 1967, making it 58 years old in 2025.

What condition is US 3 Nh 11 over Mile Hill Road 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 November 2024.

How much traffic does US 3 Nh 11 over Mile Hill Road carry?

About 8,856 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 3 Nh 11 over Mile Hill Road?

The structure is 66 ft (20.1 m) long with a longest span of 61 ft (18.6 m) and a deck 50 ft wide.

Who owns US 3 Nh 11 over Mile Hill Road?

It is owned by the State Highway Agency.