US Bridges

Hanover Center RD over Monahan Brook

Good

Grafton County, New Hampshire · 4.2 MI FR Lyme Tl · Structure no. 011401160009700

Built
1929
96 years old, rebuilt 2022
Condition
Good
inspected August 2023
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
1,167
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hanover Center RD over Monahan Brook is a concrete slab carrying Hanover Center RD over Monahan Brook in Grafton County, New Hampshire. It was built in 1929 and reconstructed in 2022, so it is 96 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 good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,167 vehicles a day, roughly 10% of them trucks, projected to reach 1,727 by 2043. The structure is 26 ft (7.9 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesHanover Center RD
CrossesMonahan Brook
Location4.2 MI FR Lyme Tl
CountyGrafton County
StateNew Hampshire
Coordinates43.71249, -72.2029
Functional classRural Minor Collector

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.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating77.4 US tons
Inventory rating59.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length26 ft (7.9 m)
Longest span22 ft (6.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.2 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 closed6.2 mi (10 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 Hanover Center RD over Monahan Brook built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2022.

What condition is Hanover Center RD over Monahan 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 Hanover Center RD over Monahan Brook carry?

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

How long is Hanover Center RD over Monahan Brook?

The structure is 26 ft (7.9 m) long with a longest span of 22 ft (6.7 m) and a deck 26 ft wide.

Who owns Hanover Center RD over Monahan Brook?

It is owned by the City or Municipal Highway Agency.