US Bridges

NH202A over Isinglass River

Fair

Strafford County, New Hampshire · 2.5 MI from Northwood Tl · Structure no. 024301450006300

Built
1923
102 years old, rebuilt 1981
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
2,212
2023 count
Owner
State
State Highway Agency

About this bridge

NH202A over Isinglass River is a steel stringer/multi-beam or girder carrying NH202A over Isinglass River in Strafford County, New Hampshire. It was built in 1923 and reconstructed in 1981, so it is 102 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 2,212 vehicles a day, roughly 4% of them trucks, projected to reach 3,273 by 2043. The structure is 25 ft (7.6 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesNH202A
CrossesIsinglass River
Location2.5 MI from Northwood Tl
RouteState Highway 202A
CountyStrafford County
StateNew Hampshire
Coordinates43.24508, -71.1444
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
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 rating43.7 US tons
Inventory rating26.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length25 ft (7.6 m)
Longest span22 ft (6.7 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,212 (2023)
Projected traffic3,273 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 NH202A over Isinglass River built?

It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1981.

What condition is NH202A over Isinglass 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 April 2024.

How much traffic does NH202A over Isinglass River carry?

About 2,212 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH202A over Isinglass River?

The structure is 25 ft (7.6 m) long with a longest span of 22 ft (6.7 m) and a deck 36 ft wide.

Who owns NH202A over Isinglass River?

It is owned by the State Highway Agency.