US Bridges

Fdr 123 over Oliverian Brook

Fair

Grafton County, New Hampshire · Map 27 · Structure no. 092204000001056

Built
1965
60 years old
Condition
Fair
inspected October 2023
Type
Slab
Wood or Timber
Length
25 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 123 over Oliverian Brook is a wood or timber slab carrying Fdr 123 over Oliverian Brook in Grafton County, New Hampshire. It was built in 1965, so it is 60 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 25 ft (7.6 m) long and 20 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesFdr 123
CrossesOliverian Brook
LocationMap 27
RouteFederal Lands Road 123
Coordinates44.00513, -71.9308
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating23.3 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6.1 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 123 over Oliverian Brook built?

It was built in 1965, making it 60 years old in 2025.

What condition is Fdr 123 over Oliverian 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 October 2023.

How much traffic does Fdr 123 over Oliverian Brook carry?

About 50 vehicles per day (latest count).

How long is Fdr 123 over Oliverian Brook?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns Fdr 123 over Oliverian Brook?

It is owned by the U.S. Forest Service.