US Bridges

Diamond Pond Road over E Branch Mohawk River

Fair

Coos County, New Hampshire · 0.83 N JCT Rt 26 · Structure no. 005001810008000

Built
1930
95 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
43 ft
1 main span
Daily traffic
96
2023 count
Owner
State
State Highway Agency

About this bridge

Diamond Pond Road over E Branch Mohawk River is a concrete tee beam carrying Diamond Pond Road over E Branch Mohawk River in Coos County, New Hampshire. It was built in 1930, so it is 95 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 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 96 vehicles a day, projected to reach 142 by 2043. The structure is 43 ft (13.2 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesDiamond Pond Road
CrossesE Branch Mohawk River
Location0.83 N JCT Rt 26
RouteState Highway 0
CountyCoos County
StateNew Hampshire
Coordinates44.88262, -71.36291
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.4 US tons
Inventory rating22.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length43 ft (13.2 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks0%
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 Diamond Pond Road over E Branch Mohawk River built?

It was built in 1930, making it 95 years old in 2025.

What condition is Diamond Pond Road over E Branch Mohawk 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 2023.

How much traffic does Diamond Pond Road over E Branch Mohawk River carry?

About 96 vehicles per day (2023 count).

How long is Diamond Pond Road over E Branch Mohawk River?

The structure is 43 ft (13.2 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns Diamond Pond Road over E Branch Mohawk River?

It is owned by the State Highway Agency.