US Bridges

Rochester Neck RD over Isinglass River

Fair

Strafford County, New Hampshire · 1.95 MI RTE 125 · Structure no. 022202250013900

Built
1979
46 years old, rebuilt 1999
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
1 main span
Daily traffic
1,329
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Rochester Neck RD over Isinglass River is a steel stringer/multi-beam or girder carrying Rochester Neck RD over Isinglass River in Strafford County, New Hampshire. It was built in 1979 and reconstructed in 1999, so it is 46 years old, younger 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 1,329 vehicles a day, roughly 4% of them trucks, projected to reach 1,966 by 2043. The structure is 67 ft (20.4 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesRochester Neck RD
CrossesIsinglass River
Location1.95 MI RTE 125
CountyStrafford County
StateNew Hampshire
Coordinates43.23352, -70.95545
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
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 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 rating27.7 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length67 ft (20.4 m)
Longest span55 ft (16.8 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,329 (2023)
Projected traffic1,966 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Rochester Neck RD over Isinglass River built?

It was built in 1979, making it 46 years old in 2025. It was reconstructed in 1999.

What condition is Rochester Neck RD 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 August 2023.

How much traffic does Rochester Neck RD over Isinglass River carry?

About 1,329 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Rochester Neck RD over Isinglass River?

The structure is 67 ft (20.4 m) long with a longest span of 55 ft (16.8 m) and a deck 28 ft wide.

Who owns Rochester Neck RD over Isinglass River?

It is owned by the City or Municipal Highway Agency.