US Bridges

Chemical Road over Warner River

Fair

Merrimack County, New Hampshire · 0.2 MI from Joppa Road · Structure no. 026301810011200

Built
1966
59 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
119 ft
2 main spans
Daily traffic
86
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Chemical Road over Warner River is a steel stringer/multi-beam or girder carrying Chemical Road over Warner River in Merrimack County, New Hampshire. It was built in 1966, so it is 59 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 86 vehicles a day, roughly 4% of them trucks, projected to reach 127 by 2043. The structure is 119 ft (36.3 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesChemical Road
CrossesWarner River
Location0.2 MI from Joppa Road
CountyMerrimack County
StateNew Hampshire
Coordinates43.28024, -71.82469
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating14 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length119 ft (36.3 m)
Longest span57 ft (17.4 m)
Deck width32 ft (9.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic86 (2023)
Projected traffic127 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Chemical Road over Warner River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Chemical Road 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 October 2024.

How much traffic does Chemical Road over Warner River carry?

About 86 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Chemical Road over Warner River?

The structure is 119 ft (36.3 m) long with a longest span of 57 ft (17.4 m) and a deck 32 ft wide.

Who owns Chemical Road over Warner River?

It is owned by the City or Municipal Highway Agency.