US Bridges

SR 27 over Mccoy Creek

Good

Whitman County, Washington · 21.2 N JCT SR 272 · Structure no. 0007523A0000000

Built
1964
61 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
1,344
2023 count
Owner
State
State Highway Agency

About this bridge

SR 27 over Mccoy Creek is a concrete slab carrying SR 27 over Mccoy Creek in Whitman County, Washington. It was built in 1964, so it is 61 years old, older 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 1,344 vehicles a day, roughly 10% of them trucks, projected to reach 1,425 by 2039. The structure is 33 ft (10.1 m) long and 51 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesSR 27
CrossesMccoy Creek
Location21.2 N JCT SR 272
RouteState Highway 27
Coordinates47.13086, -117.24258
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.9 US tons
Inventory rating47 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width51 ft (15.6 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,344 (2023)
Projected traffic1,425 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$470,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 27 over Mccoy Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is SR 27 over Mccoy 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 April 2023.

How much traffic does SR 27 over Mccoy Creek carry?

About 1,344 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 27 over Mccoy Creek?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 51 ft wide.

Who owns SR 27 over Mccoy Creek?

It is owned by the State Highway Agency.