US Bridges

Pearl Lake Road over Pearl Lake Brook

Fair

Grafton County, New Hampshire · 0.7 MI FR Nh RTE 112 · Structure no. 015000820007600

Built
1928
97 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Concrete
Length
30 ft
1 main span
Daily traffic
1,167
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Pearl Lake Road over Pearl Lake Brook is a concrete arch - deck carrying Pearl Lake Road over Pearl Lake Brook in Grafton County, New Hampshire. It was built in 1928, so it is 97 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 fair condition with a lowest component rating of 5 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 1,167 vehicles a day, roughly 10% of them trucks, projected to reach 1,727 by 2043. The structure is 30 ft (9.1 m) long and 23 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesPearl Lake Road
CrossesPearl Lake Brook
Location0.7 MI FR Nh RTE 112
CountyGrafton County
StateNew Hampshire
Coordinates44.21191, -71.89409
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating27 US tons
Inventory rating19 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width23 ft (7.1 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,167 (2023)
Projected traffic1,727 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Pearl Lake Road over Pearl Lake Brook built?

It was built in 1928, making it 97 years old in 2025.

What condition is Pearl Lake Road over Pearl Lake 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 September 2024.

How much traffic does Pearl Lake Road over Pearl Lake Brook carry?

About 1,167 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Pearl Lake Road over Pearl Lake Brook?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns Pearl Lake Road over Pearl Lake Brook?

It is owned by the City or Municipal Highway Agency.