US Bridges

NH136 over Otter Brook

Fair

Hillsborough County, New Hampshire · 1.9 MI E Greenfield Tl · Structure no. 020801270013300

Built
1968
57 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
25 ft
1 main span
Daily traffic
2,518
2023 count
Owner
State
State Highway Agency

About this bridge

NH136 over Otter Brook is a concrete slab carrying NH136 over Otter Brook in Hillsborough County, New Hampshire. It was built in 1968, so it is 57 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 2,518 vehicles a day, roughly 4% of them trucks, projected to reach 3,726 by 2043. The structure is 25 ft (7.6 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNH136
CrossesOtter Brook
Location1.9 MI E Greenfield Tl
RouteState Highway 136
CountyHillsborough County
StateNew Hampshire
Coordinates42.91444, -71.9207
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.6 US tons
Inventory rating48.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,518 (2023)
Projected traffic3,726 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 NH136 over Otter Brook built?

It was built in 1968, making it 57 years old in 2025.

What condition is NH136 over Otter Brook 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 May 2024.

How much traffic does NH136 over Otter Brook carry?

About 2,518 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is NH136 over Otter Brook?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 28 ft wide.

Who owns NH136 over Otter Brook?

It is owned by the State Highway Agency.