US Bridges

FSR 618 over Res Tank Wash

Fair

Coconino County, Arizona · .3 MI W/O Bruce B Trail · Structure no. 030401000003309

Built
1954
71 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
70 ft
3 main spans
Daily traffic
100
2021 count
Owner
Federal
U.S. Forest Service

About this bridge

FSR 618 over Res Tank Wash is a concrete continuous slab carrying FSR 618 over Res Tank Wash in Coconino County, Arizona. It was built in 1954, so it is 71 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 70 ft (21.3 m) long and 16 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesFSR 618
CrossesRes Tank Wash
Location.3 MI W/O Bruce B Trail
RouteFederal Lands Road 618
CountyCoconino County
StateArizona
Coordinates34.67964, -111.72306
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.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating23.3 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span27 ft (8.2 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2021)
Projected traffic125 by 2040
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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$320,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FSR 618 over Res Tank Wash built?

It was built in 1954, making it 71 years old in 2025.

What condition is FSR 618 over Res Tank Wash 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 618 over Res Tank Wash carry?

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

How long is FSR 618 over Res Tank Wash?

The structure is 70 ft (21.3 m) long with a longest span of 27 ft (8.2 m) and a deck 16 ft wide.

Who owns FSR 618 over Res Tank Wash?

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