US Bridges

Bog Road over Sand Brook

Good

Hillsborough County, New Hampshire · 0.58 MI N Gould Pond JCT · Structure no. 012201520009500

Built
2015
10 years old
Condition
Good
inspected October 2024
Type
Frame
Concrete
Length
25 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Bog Road over Sand Brook is a concrete frame carrying Bog Road over Sand Brook in Hillsborough County, New Hampshire. It was built in 2015, so it is 10 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 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 25 ft (7.6 m) long and 37 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesBog Road
CrossesSand Brook
Location0.58 MI N Gould Pond JCT
CountyHillsborough County
StateNew Hampshire
Coordinates43.15649, -71.90104
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.6 US tons
Inventory rating42.9 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width37 ft (11.3 m)
Roadway width33 ft (10.1 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 closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Bog Road over Sand Brook built?

It was built in 2015, making it 10 years old in 2025.

What condition is Bog Road over Sand Brook 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 October 2024.

How much traffic does Bog Road over Sand Brook carry?

About 96 vehicles per day (2023 count).

How long is Bog Road over Sand Brook?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 37 ft wide.

Who owns Bog Road over Sand Brook?

It is owned by the City or Municipal Highway Agency.