US Bridges

FSR 651 over Walnut Canyon

Fair

Coconino County, Arizona · 0.1 MI of Pine Grove Cg · Structure no. 030405000004502

Built
1964
61 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
37 ft
1 main span
Daily traffic
100
2021 count
Owner
Federal
U.S. Forest Service

About this bridge

FSR 651 over Walnut Canyon is a wood or timber stringer/multi-beam or girder carrying FSR 651 over Walnut Canyon in Coconino County, Arizona. It was built in 1964, so it is 61 years old, older than the Arizona average of 47.8 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 100 vehicles a day, roughly 5% of them trucks, projected to reach 150 by 2040. The structure is 37 ft (11.2 m) long and 25 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesFSR 651
CrossesWalnut Canyon
Location0.1 MI of Pine Grove Cg
RouteFederal Lands Road 651
CountyCoconino County
StateArizona
Coordinates35.02743, -111.45497
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating32.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length37 ft (11.2 m)
Longest span35 ft (10.7 m)
Deck width25 ft (7.7 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic150 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$170,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FSR 651 over Walnut Canyon built?

It was built in 1964, making it 61 years old in 2025.

What condition is FSR 651 over Walnut Canyon 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 2023.

How much traffic does FSR 651 over Walnut Canyon carry?

About 100 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is FSR 651 over Walnut Canyon?

The structure is 37 ft (11.2 m) long with a longest span of 35 ft (10.7 m) and a deck 25 ft wide.

Who owns FSR 651 over Walnut Canyon?

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