US Bridges

Gregg Lake Road over Gregg Lake

Good

Hillsborough County, New Hampshire · Town RD · Structure no. 000901190009100

Built
1997
28 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete
Length
36 ft
1 main span
Daily traffic
201
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Gregg Lake Road over Gregg Lake is a concrete slab carrying Gregg Lake Road over Gregg Lake in Hillsborough County, New Hampshire. It was built in 1997, so it is 28 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 201 vehicles a day, roughly 4% of them trucks, projected to reach 297 by 2043. The structure is 36 ft (11 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesGregg Lake Road
CrossesGregg Lake
LocationTown RD
CountyHillsborough County
StateNew Hampshire
Coordinates43.04309, -71.99124
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating96 US tons
Inventory rating57 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length36 ft (11 m)
Longest span27 ft (8.2 m)
Deck width24 ft (7.3 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic201 (2023)
Projected traffic297 by 2043
Trucks4%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Gregg Lake Road over Gregg Lake built?

It was built in 1997, making it 28 years old in 2025.

What condition is Gregg Lake Road over Gregg Lake 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 June 2024.

How much traffic does Gregg Lake Road over Gregg Lake carry?

About 201 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Gregg Lake Road over Gregg Lake?

The structure is 36 ft (11 m) long with a longest span of 27 ft (8.2 m) and a deck 24 ft wide.

Who owns Gregg Lake Road over Gregg Lake?

It is owned by the City or Municipal Highway Agency.