US Bridges

KITZMILLER/5520 over Missouri Flat Creek

Fair

Whitman County, Washington · 0.43 MI SE Whelan · Structure no. 083902000000000

Built
1965
60 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
237
2020 count
Owner
County
County Highway Agency

About this bridge

KITZMILLER/5520 over Missouri Flat Creek is a prestressed concrete stringer/multi-beam or girder carrying KITZMILLER/5520 over Missouri Flat Creek in Whitman County, Washington. It was built in 1965, so it is 60 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 237 vehicles a day, roughly 25% of them trucks, projected to reach 242 by 2039. The structure is 24 ft (7.3 m) long and 24 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesKITZMILLER/5520
CrossesMissouri Flat Creek
Location0.43 MI SE Whelan
RouteCounty Highway 55200
CountyWhitman County
StateWashington
Coordinates46.75465, -117.16917
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span23 ft (6.9 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic237 (2020)
Projected traffic242 by 2039
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was KITZMILLER/5520 over Missouri Flat Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is KITZMILLER/5520 over Missouri Flat Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.

How much traffic does KITZMILLER/5520 over Missouri Flat Creek carry?

About 237 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is KITZMILLER/5520 over Missouri Flat Creek?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (6.9 m) and a deck 24 ft wide.

Who owns KITZMILLER/5520 over Missouri Flat Creek?

It is owned by the County Highway Agency.