US Bridges

NH286 over Blackwater River

Fair

Rockingham County, New Hampshire · .1 MI JCT Rt 1-A · Structure no. 023402150005600

Built
1991
34 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
1 main span
Daily traffic
13,696
2023 count
Owner
State
State Highway Agency

About this bridge

NH286 over Blackwater River is a steel stringer/multi-beam or girder carrying NH286 over Blackwater River in Rockingham County, New Hampshire. It was built in 1991, so it is 34 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 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 13,696 vehicles a day, roughly 4% of them trucks, projected to reach 20,270 by 2043. The structure is 95 ft (29 m) long and 47 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesNH286
CrossesBlackwater River
Location.1 MI JCT Rt 1-A
RouteState Highway 286
CountyRockingham County
StateNew Hampshire
Coordinates42.87123, -70.82444
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.5 US tons
Inventory rating51.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length95 ft (29 m)
Longest span90 ft (27.4 m)
Deck width47 ft (14.2 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,696 (2023)
Projected traffic20,270 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
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 NH286 over Blackwater River built?

It was built in 1991, making it 34 years old in 2025.

What condition is NH286 over Blackwater 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 NH286 over Blackwater River carry?

About 13,696 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH286 over Blackwater River?

The structure is 95 ft (29 m) long with a longest span of 90 ft (27.4 m) and a deck 47 ft wide.

Who owns NH286 over Blackwater River?

It is owned by the State Highway Agency.