US Bridges

Ash Hill Road over Pettyboro Brook

Fair

Grafton County, New Hampshire · 1.9 MI FR Lisbon Tl · Structure no. 015601010004200

Built
1984
41 years old
Condition
Fair
inspected August 2023
Type
Culvert
Steel
Length
20 ft
1 main span
Daily traffic
96
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Ash Hill Road over Pettyboro Brook is a steel culvert carrying Ash Hill Road over Pettyboro Brook in Grafton County, New Hampshire. It was built in 1984, so it is 41 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 fair condition with a lowest component rating of 6 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, roughly 4% of them trucks, projected to reach 142 by 2043. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 5 mi (8 km).

CarriesAsh Hill Road
CrossesPettyboro Brook
Location1.9 MI FR Lisbon Tl
Coordinates44.22374, -71.96045
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic142 by 2043
Trucks4%
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

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 Ash Hill Road over Pettyboro Brook built?

It was built in 1984, making it 41 years old in 2025.

What condition is Ash Hill Road over Pettyboro Brook 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 August 2023.

How much traffic does Ash Hill Road over Pettyboro Brook carry?

About 96 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Ash Hill Road over Pettyboro Brook?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m).

Who owns Ash Hill Road over Pettyboro Brook?

It is owned by the City or Municipal Highway Agency.