US Bridges

Spokane Street over Mill Creek

Good

Walla Walla County, Washington · 0.5 MI SE of Main Street · Structure no. 089196000000000

Built
2020
5 years old
Condition
Good
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
63 ft
1 main span
Daily traffic
1,300
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Spokane Street over Mill Creek is a prestressed concrete tee beam carrying Spokane Street over Mill Creek in Walla Walla County, Washington. It was built in 2020, so it is 5 years old, younger than the Washington average of 49.8 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 1,300 vehicles a day, roughly 5% of them trucks, projected to reach 1,650 by 2040. The structure is 63 ft (19.2 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSpokane Street
CrossesMill Creek
Location0.5 MI SE of Main Street
RouteCity Street 1365
Coordinates46.06836, -118.33561
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating42.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length63 ft (19.2 m)
Longest span61 ft (18.6 m)
Deck width68 ft (20.8 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2023)
Projected traffic1,650 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Spokane Street over Mill Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is Spokane Street over Mill 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 September 2023.

How much traffic does Spokane Street over Mill Creek carry?

About 1,300 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Spokane Street over Mill Creek?

The structure is 63 ft (19.2 m) long with a longest span of 61 ft (18.6 m) and a deck 68 ft wide.

Who owns Spokane Street over Mill Creek?

It is owned by the City or Municipal Highway Agency.