US Bridges

Schoolhouse Lane over Mink Brook

Good

Grafton County, New Hampshire · 0.9 MI from Greensboro R · Structure no. 011401080006600

Built
1981
44 years old
Condition
Good
inspected August 2023
Type
Culvert
Steel
Length
23 ft
1 main span
Daily traffic
510
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Schoolhouse Lane over Mink Brook is a steel culvert carrying Schoolhouse Lane over Mink Brook in Grafton County, New Hampshire. It was built in 1981, so it is 44 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 510 vehicles a day, projected to reach 754 by 2043. The structure is 23 ft (7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSchoolhouse Lane
CrossesMink Brook
Location0.9 MI from Greensboro R
CountyGrafton County
StateNew Hampshire
Coordinates43.69338, -72.21986
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating95.9 US tons
Inventory rating71.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span23 ft (7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2023)
Projected traffic754 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 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 Schoolhouse Lane over Mink Brook built?

It was built in 1981, making it 44 years old in 2025.

What condition is Schoolhouse Lane over Mink 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 August 2023.

How much traffic does Schoolhouse Lane over Mink Brook carry?

About 510 vehicles per day (2023 count).

How long is Schoolhouse Lane over Mink Brook?

The structure is 23 ft (7 m) long with a longest span of 23 ft (7 m).

Who owns Schoolhouse Lane over Mink Brook?

It is owned by the City or Municipal Highway Agency.