US Bridges

90th ST over Creek

Fair

Scott County, Iowa · 078E21502 · Structure no. 000000000302211

Built
1997
28 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
35
2022 count
Owner
County
County Highway Agency

About this bridge

90th ST over Creek is a prestressed concrete tee beam carrying 90th ST over Creek in Scott County, Iowa. It was built in 1997, so it is 28 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 5 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 35 vehicles a day, roughly 20% of them trucks, projected to reach 35 by 2043. The structure is 42 ft (12.8 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries90th ST
CrossesCreek
Location078E21502
RouteCounty Highway 0
StateIowa
Coordinates41.55731, -90.72642
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating71.5 US tons
Inventory rating42.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span39 ft (11.9 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2022)
Projected traffic35 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 90th ST over Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is 90th ST over 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 May 2023.

How much traffic does 90th ST over Creek carry?

About 35 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is 90th ST over Creek?

The structure is 42 ft (12.8 m) long with a longest span of 39 ft (11.9 m) and a deck 29 ft wide.

Who owns 90th ST over Creek?

It is owned by the County Highway Agency.