US Bridges

Koala Ave over Trib to Middle River

Fair

Guthrie County, Iowa · 078321602 · Structure no. 000000000167101

Built
2009
16 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

Koala Ave over Trib to Middle River is a prestressed concrete tee beam carrying Koala Ave over Trib to Middle River in Guthrie County, Iowa. It was built in 2009, so it is 16 years old, younger than the Iowa average of 45.5 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 50 vehicles a day, projected to reach 50 by 2043. The structure is 37 ft (11.3 m) long and 25 ft wide.

Location

Open in Google Maps
CarriesKoala Ave
CrossesTrib to Middle River
Location078321602
RouteCounty Highway 0
CountyGuthrie County
StateIowa
Coordinates41.55524, -94.54811
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.5 US tons
Inventory rating26.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span35 ft (10.7 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Koala Ave over Trib to Middle River built?

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

What condition is Koala Ave over Trib to Middle River 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 November 2023.

How much traffic does Koala Ave over Trib to Middle River carry?

About 50 vehicles per day (2022 count).

How long is Koala Ave over Trib to Middle River?

The structure is 37 ft (11.3 m) long with a longest span of 35 ft (10.7 m) and a deck 25 ft wide.

Who owns Koala Ave over Trib to Middle River?

It is owned by the County Highway Agency.