US Bridges

Coon Brook Road over So Br Sugar River

Good

Sullivan County, New Hampshire · 390 Ft from Nh 10 · Structure no. 019201470003600

Built
1960
65 years old, rebuilt 2019
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
49 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coon Brook Road over So Br Sugar River is a steel stringer/multi-beam or girder carrying Coon Brook Road over So Br Sugar River in Sullivan County, New Hampshire. It was built in 1960 and reconstructed in 2019, so it is 65 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 96 vehicles a day, projected to reach 142 by 2043. The structure is 49 ft (14.9 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCoon Brook Road
CrossesSo Br Sugar River
Location390 Ft from Nh 10
CountySullivan County
StateNew Hampshire
Coordinates43.3152, -72.16854
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating63.9 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length49 ft (14.9 m)
Longest span45 ft (13.7 m)
Deck width25 ft (7.6 m)
Roadway width21 ft (6.3 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 closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Coon Brook Road over So Br Sugar River built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2019.

What condition is Coon Brook Road over So Br Sugar River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does Coon Brook Road over So Br Sugar River carry?

About 96 vehicles per day (2023 count).

How long is Coon Brook Road over So Br Sugar River?

The structure is 49 ft (14.9 m) long with a longest span of 45 ft (13.7 m) and a deck 25 ft wide.

Who owns Coon Brook Road over So Br Sugar River?

It is owned by the City or Municipal Highway Agency.