US Bridges

NH103 over Warner River

Fair

Merrimack County, New Hampshire · 0.1 MI from JCT I-89 · Structure no. 026301450005300

Built
1936
89 years old, rebuilt 1991
Condition
Fair
inspected June 2023
Type
Girder and Floorbeam System
Steel
Length
81 ft
1 main span
Daily traffic
3,778
2023 count
Owner
State
State Highway Agency

About this bridge

NH103 over Warner River is a steel girder and floorbeam system carrying NH103 over Warner River in Merrimack County, New Hampshire. It was built in 1936 and reconstructed in 1991, so it is 89 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 3,778 vehicles a day, roughly 4% of them trucks, projected to reach 5,591 by 2043. The structure is 81 ft (24.7 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNH103
CrossesWarner River
Location0.1 MI from JCT I-89
RouteState Highway 103
CountyMerrimack County
StateNew Hampshire
Coordinates43.28706, -71.88797
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length81 ft (24.7 m)
Longest span71 ft (21.6 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,778 (2023)
Projected traffic5,591 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 NH103 over Warner River built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1991.

What condition is NH103 over Warner 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 June 2023.

How much traffic does NH103 over Warner River carry?

About 3,778 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH103 over Warner River?

The structure is 81 ft (24.7 m) long with a longest span of 71 ft (21.6 m) and a deck 32 ft wide.

Who owns NH103 over Warner River?

It is owned by the State Highway Agency.