US Bridges

SR366 over Grant Creek

Good

Graham County, Arizona · _ · Structure no. 07359

Built
2022
3 years old
Condition
Good
inspected December 2024
Type
Culvert
Concrete
Length
30 ft
3 main spans
Daily traffic
704
2023 count
Owner
State
State Highway Agency

About this bridge

SR366 over Grant Creek is a concrete culvert carrying SR366 over Grant Creek in Graham County, Arizona. It was built in 2022, so it is 3 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 704 vehicles a day, roughly 2% of them trucks, projected to reach 714 by 2042. The structure is 30 ft (9.1 m) long. If it were closed, the detour would be 100 mi (161 km).

CarriesSR366
CrossesGrant Creek
Location_
RouteState Highway 366
StateArizona
Coordinates32.678, -109.8844
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length30 ft (9.1 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic704 (2023)
Projected traffic714 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR366 over Grant Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is SR366 over Grant Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2024.

How much traffic does SR366 over Grant Creek carry?

About 704 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is SR366 over Grant Creek?

The structure is 30 ft (9.1 m) long with a longest span of 10 ft (3 m).

Who owns SR366 over Grant Creek?

It is owned by the State Highway Agency.