US Bridges

WHELAN/5515 over Missouri Flat Creek

Good

Whitman County, Washington · 3.33 MI NE SR 27 · Structure no. 089012000000000

Built
2018
7 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
180
2020 count
Owner
County
County Highway Agency

About this bridge

WHELAN/5515 over Missouri Flat Creek is a prestressed concrete stringer/multi-beam or girder carrying WHELAN/5515 over Missouri Flat Creek in Whitman County, Washington. It was built in 2018, so it is 7 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 180 vehicles a day, roughly 25% of them trucks, projected to reach 180 by 2039. The structure is 44 ft (13.4 m) long and 30 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
Location3.33 MI NE SR 27
RouteCounty Highway 55150
CountyWhitman County
StateWashington
Coordinates46.77857, -117.10998
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating50 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (2020)
Projected traffic180 by 2039
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was WHELAN/5515 over Missouri Flat Creek built?

It was built in 2018, making it 7 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 November 2024.

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

About 180 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is WHELAN/5515 over Missouri Flat Creek?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 30 ft wide.

Who owns WHELAN/5515 over Missouri Flat Creek?

It is owned by the County Highway Agency.