US Bridges

SR 177 over Steamboat Wash

Good

Pinal County, Arizona · 9.4 MI West JCT SR 77 · Structure no. 05054

Built
1958
67 years old
Condition
Good
inspected February 2022
Type
Culvert
Concrete Continuous
Length
88 ft
7 main spans
Daily traffic
2,319
2021 count
Owner
State
State Highway Agency

About this bridge

SR 177 over Steamboat Wash is a concrete continuous culvert carrying SR 177 over Steamboat Wash in Pinal County, Arizona. It was built in 1958, so it is 67 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,319 vehicles a day, roughly 11% of them trucks, projected to reach 2,329 by 2041. The structure is 88 ft (26.8 m) long. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesSR 177
CrossesSteamboat Wash
Location9.4 MI West JCT SR 77
RouteState Highway 177
CountyPinal County
StateArizona
Coordinates33.062, -110.9073
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating79 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans7
Design loadHS 20
Structure length88 ft (26.8 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 traffic2,319 (2021)
Projected traffic2,329 by 2041
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 SR 177 over Steamboat Wash built?

It was built in 1958, making it 67 years old in 2025.

What condition is SR 177 over Steamboat Wash 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 February 2022.

How much traffic does SR 177 over Steamboat Wash carry?

About 2,319 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is SR 177 over Steamboat Wash?

The structure is 88 ft (26.8 m) long with a longest span of 10 ft (3 m).

Who owns SR 177 over Steamboat Wash?

It is owned by the State Highway Agency.