US Bridges

S Palouse ST over Mill Creek

Good

Walla Walla County, Washington · Palouse ST at Mill CR · Structure no. 088030000000000

Built
2009
16 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
7,980
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

S Palouse ST over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying S Palouse ST over Mill Creek in Walla Walla County, Washington. It was built in 2009, so it is 16 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 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 7,980 vehicles a day, roughly 5% of them trucks, projected to reach 17,500 by 2043. The structure is 64 ft (19.5 m) long and 80 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS Palouse ST
CrossesMill Creek
LocationPalouse ST at Mill CR
RouteCity Street 1365
Coordinates46.06898, -118.33473
Functional classUrban Collector

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.
Superstructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating37.5 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length64 ft (19.5 m)
Longest span61 ft (18.6 m)
Deck width80 ft (24.4 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,980 (2023)
Projected traffic17,500 by 2043
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S Palouse ST over Mill Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is S Palouse ST 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 S Palouse ST over Mill Creek carry?

About 7,980 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S Palouse ST over Mill Creek?

The structure is 64 ft (19.5 m) long with a longest span of 61 ft (18.6 m) and a deck 80 ft wide.

Who owns S Palouse ST over Mill Creek?

It is owned by the City or Municipal Highway Agency.