US Bridges

Mason Road over Nissitissit River

Fair

Hillsborough County, New Hampshire · .49 MI NW JCT 13 · Structure no. 003400800007800

Built
1932
93 years old
Condition
Fair
inspected June 2024
Type
Frame
Concrete
Length
57 ft
1 main span
Daily traffic
3,176
2023 count
Owner
State
State Highway Agency

About this bridge

Mason Road over Nissitissit River is a concrete frame carrying Mason Road over Nissitissit River in Hillsborough County, New Hampshire. It was built in 1932, so it is 93 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 3,176 vehicles a day, roughly 10% of them trucks, projected to reach 4,700 by 2043. The structure is 57 ft (17.4 m) long and 24 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesMason Road
CrossesNissitissit River
Location.49 MI NW JCT 13
RouteState Highway 0
CountyHillsborough County
StateNew Hampshire
Coordinates42.73566, -71.67148
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.6 US tons
Inventory rating21.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length57 ft (17.4 m)
Longest span50 ft (15.2 m)
Deck width24 ft (7.3 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,176 (2023)
Projected traffic4,700 by 2043
Trucks10%
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

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 Mason Road over Nissitissit River built?

It was built in 1932, making it 93 years old in 2025.

What condition is Mason Road over Nissitissit 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 2024.

How much traffic does Mason Road over Nissitissit River carry?

About 3,176 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Mason Road over Nissitissit River?

The structure is 57 ft (17.4 m) long with a longest span of 50 ft (15.2 m) and a deck 24 ft wide.

Who owns Mason Road over Nissitissit River?

It is owned by the State Highway Agency.