US Bridges

Loon Mountain Road over E Br Pemigewasset River

Good

Grafton County, New Hampshire · 315 Ft from Nh RTE 112 · Structure no. 014802120015100

Built
2016
9 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
295 ft
3 main spans
Daily traffic
1,555
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Loon Mountain Road over E Br Pemigewasset River is a steel continuous stringer/multi-beam or girder carrying Loon Mountain Road over E Br Pemigewasset River in Grafton County, New Hampshire. It was built in 2016, so it is 9 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 1,555 vehicles a day, roughly 4% of them trucks, projected to reach 2,301 by 2043. The structure is 295 ft (89.8 m) long and 49 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesLoon Mountain Road
CrossesE Br Pemigewasset River
Location315 Ft from Nh RTE 112
Coordinates44.0569, -71.63413
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
Deck9 ExcellentNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating36.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length295 ft (89.8 m)
Longest span106 ft (32.3 m)
Deck width49 ft (14.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,555 (2023)
Projected traffic2,301 by 2043
Trucks4%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 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 Loon Mountain Road over E Br Pemigewasset River built?

It was built in 2016, making it 9 years old in 2025.

What condition is Loon Mountain Road over E Br Pemigewasset 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 August 2024.

How much traffic does Loon Mountain Road over E Br Pemigewasset River carry?

About 1,555 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Loon Mountain Road over E Br Pemigewasset River?

The structure is 295 ft (89.8 m) long with a longest span of 106 ft (32.3 m) and a deck 49 ft wide.

Who owns Loon Mountain Road over E Br Pemigewasset River?

It is owned by the City or Municipal Highway Agency.