US Bridges

NH113B over Mcdonough Brook

Fair

Carroll County, New Hampshire · 7.27 MI N. Conway T.L. · Structure no. 004301760012500

Built
1953
72 years old
Condition
Fair
inspected July 2024
Type
Culvert
Steel
Length
24 ft
1 main span
Daily traffic
88
2023 count
Owner
State
State Highway Agency

About this bridge

NH113B over Mcdonough Brook is a steel culvert carrying NH113B over Mcdonough Brook in Carroll County, New Hampshire. It was built in 1953, so it is 72 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 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 88 vehicles a day, roughly 10% of them trucks, projected to reach 130 by 2043. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNH113B
CrossesMcdonough Brook
Location7.27 MI N. Conway T.L.
RouteState Highway 0
CountyCarroll County
StateNew Hampshire
Coordinates44.17401, -71.01096
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.9 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88 (2023)
Projected traffic130 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 NH113B over Mcdonough Brook built?

It was built in 1953, making it 72 years old in 2025.

What condition is NH113B over Mcdonough 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 July 2024.

How much traffic does NH113B over Mcdonough Brook carry?

About 88 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NH113B over Mcdonough Brook?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m).

Who owns NH113B over Mcdonough Brook?

It is owned by the State Highway Agency.