US Bridges

FSR 708 over Sycamore Canyon

Fair

Yavapai County, Arizona · .4 MI N/O Hackberry Cny · Structure no. 030401000004120

Built
1959
66 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
100
2022 count
Owner
Federal
U.S. Forest Service

About this bridge

FSR 708 over Sycamore Canyon is a concrete tee beam carrying FSR 708 over Sycamore Canyon in Yavapai County, Arizona. It was built in 1959, so it is 66 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 125 by 2040. The structure is 32 ft (9.9 m) long and 23 ft wide. If it were closed, the detour would be 59.7 mi (96 km).

Location

Open in Google Maps
CarriesFSR 708
CrossesSycamore Canyon
Location.4 MI N/O Hackberry Cny
RouteFederal Lands Road 708
CountyYavapai County
StateArizona
Coordinates34.46286, -111.71519
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating40 US tons
Inventory rating31.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.9 m)
Longest span31 ft (9.5 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic125 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed59.7 mi (96 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$80,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FSR 708 over Sycamore Canyon built?

It was built in 1959, making it 66 years old in 2025.

What condition is FSR 708 over Sycamore 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 August 2023.

How much traffic does FSR 708 over Sycamore Canyon carry?

About 100 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is FSR 708 over Sycamore Canyon?

The structure is 32 ft (9.9 m) long with a longest span of 31 ft (9.5 m) and a deck 23 ft wide.

Who owns FSR 708 over Sycamore Canyon?

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