US Bridges

Centenary Avenue over Nhrr

PoorPosted for load

Belknap County, New Hampshire · Town RD · Structure no. 013901260016300

Built
1940
85 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
121 ft
7 main spans
Daily traffic
510
2023 count
Owner
State
State Highway Agency

About this bridge

Centenary Avenue over Nhrr is a wood or timber stringer/multi-beam or girder carrying Centenary Avenue over Nhrr in Belknap County, New Hampshire. It was built in 1940, so it is 85 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 510 vehicles a day, roughly 4% of them trucks, projected to reach 754 by 2043. The structure is 121 ft (36.9 m) long and 23 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCentenary Avenue
CrossesNhrr
LocationTown RD
Coordinates43.60946, -71.46106
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 8 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment2: Basically intolerable, requiring high priority of replacement
Operating rating11.9 US tons
Inventory rating8.8 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans7
Design loadUnknown
Structure length121 ft (36.9 m)
Longest span22 ft (6.7 m)
Deck width23 ft (6.9 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2023)
Projected traffic754 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Centenary Avenue over Nhrr built?

It was built in 1940, making it 85 years old in 2025.

What condition is Centenary Avenue over Nhrr in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Centenary Avenue over Nhrr carry?

About 510 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Centenary Avenue over Nhrr?

The structure is 121 ft (36.9 m) long with a longest span of 22 ft (6.7 m) and a deck 23 ft wide.

Who owns Centenary Avenue over Nhrr?

It is owned by the State Highway Agency.