US Bridges

Mt Clinton Road over Sokokis Brook

Fair

Coos County, New Hampshire · 3.57 MI NE JCT 302 · Structure no. 005550900017900

Built
1934
91 years old
Condition
Fair
inspected June 2024
Type
Culvert
Steel
Length
20 ft
1 main span
Daily traffic
102
2023 count
Owner
State
State Highway Agency

About this bridge

Mt Clinton Road over Sokokis Brook is a steel culvert carrying Mt Clinton Road over Sokokis Brook in Coos County, New Hampshire. It was built in 1934, so it is 91 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 102 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMt Clinton Road
CrossesSokokis Brook
Location3.57 MI NE JCT 302
RouteState Highway 0
CountyCoos County
StateNew Hampshire
Coordinates44.2611, -71.38345
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic102 (2023)
Projected traffic150 by 2043
Trucks10%
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

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 Mt Clinton Road over Sokokis Brook built?

It was built in 1934, making it 91 years old in 2025.

What condition is Mt Clinton Road over Sokokis 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 June 2024.

How much traffic does Mt Clinton Road over Sokokis Brook carry?

About 102 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Mt Clinton Road over Sokokis Brook?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m).

Who owns Mt Clinton Road over Sokokis Brook?

It is owned by the State Highway Agency.