US Bridges

16th Ave over Cedar River

Good

Linn County, Iowa · 083072808 · Structure no. 000000000001241

Built
1989
36 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
615 ft
7 main spans
Daily traffic
3,197
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

16th Ave over Cedar River is a prestressed concrete stringer/multi-beam or girder carrying 16th Ave over Cedar River in Linn County, Iowa. It was built in 1989, so it is 36 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,197 vehicles a day, projected to reach 3,197 by 2044. The structure is 615 ft (187.5 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries16th Ave
CrossesCedar River
Location083072808
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates41.96607, -91.65987
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating75 US tons
Inventory rating44.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length615 ft (187.5 m)
Longest span88 ft (26.8 m)
Deck width49 ft (14.9 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,197 (2022)
Projected traffic3,197 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 16th Ave over Cedar River built?

It was built in 1989, making it 36 years old in 2025.

What condition is 16th Ave over Cedar River 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 July 2024.

How much traffic does 16th Ave over Cedar River carry?

About 3,197 vehicles per day (2022 count).

How long is 16th Ave over Cedar River?

The structure is 615 ft (187.5 m) long with a longest span of 88 ft (26.8 m) and a deck 49 ft wide.

Who owns 16th Ave over Cedar River?

It is owned by the City or Municipal Highway Agency.