US Bridges

Ia 922-1st Ave over Cedar River

Fair

Linn County, Iowa · 0.2 Mi. N of I-380 · Structure no. 000000000033490

Built
1920
105 years old, rebuilt 1964
Condition
Fair
inspected October 2022
Type
Arch - Deck
Concrete Continuous
Length
697 ft
6 main spans
Daily traffic
13,000
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 922-1st Ave over Cedar River is a concrete continuous arch - deck carrying Ia 922-1st Ave over Cedar River in Linn County, Iowa. It was built in 1920 and reconstructed in 1964, so it is 105 years old, older 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 13,000 vehicles a day, roughly 3% of them trucks, projected to reach 13,000 by 2042. The structure is 697 ft (212.4 m) long and 98 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIa 922-1st Ave
CrossesCedar River
Location0.2 Mi. N of I-380
RouteState Highway 922
CountyLinn County
StateIowa
Coordinates41.97676, -91.67271
Functional classUrban Other Principal Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length697 ft (212.4 m)
Longest span113 ft (34.4 m)
Deck width98 ft (29.9 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2022)
Projected traffic13,000 by 2042
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 922-1st Ave over Cedar River built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1964.

What condition is Ia 922-1st Ave over Cedar 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 October 2022.

How much traffic does Ia 922-1st Ave over Cedar River carry?

About 13,000 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Ia 922-1st Ave over Cedar River?

The structure is 697 ft (212.4 m) long with a longest span of 113 ft (34.4 m) and a deck 98 ft wide.

Who owns Ia 922-1st Ave over Cedar River?

It is owned by the State Highway Agency and maintained by the City or Municipal Highway Agency.