US Bridges

WHELAN/5515 over Missouri Flat Creek

Good

Whitman County, Washington · 1.90 MI E SR 27 · Structure no. 087331000000000

Built
2005
20 years old
Condition
Good
inspected December 2023
Type
Slab
Prestressed Concrete
Length
65 ft
1 main span
Daily traffic
278
2021 count
Owner
County
County Highway Agency

About this bridge

WHELAN/5515 over Missouri Flat Creek is a prestressed concrete slab carrying WHELAN/5515 over Missouri Flat Creek in Whitman County, Washington. It was built in 2005, so it is 20 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 278 vehicles a day, roughly 25% of them trucks, projected to reach 278 by 2044. The structure is 65 ft (19.8 m) long and 36 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesWHELAN/5515
CrossesMissouri Flat Creek
Location1.90 MI E SR 27
RouteCounty Highway 55150
CountyWhitman County
StateWashington
Coordinates46.77127, -117.13528
Functional classRural Minor 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating68.9 US tons
Inventory rating43.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length65 ft (19.8 m)
Longest span62 ft (18.9 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic278 (2021)
Projected traffic278 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was WHELAN/5515 over Missouri Flat Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is WHELAN/5515 over Missouri Flat 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 2023.

How much traffic does WHELAN/5515 over Missouri Flat Creek carry?

About 278 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is WHELAN/5515 over Missouri Flat Creek?

The structure is 65 ft (19.8 m) long with a longest span of 62 ft (18.9 m) and a deck 36 ft wide.

Who owns WHELAN/5515 over Missouri Flat Creek?

It is owned by the County Highway Agency.