US Bridges

A Ave over 4th ST & RR

Fair

Linn County, Iowa · 000000000 · Structure no. 000000000502970

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
324 ft
4 main spans
Daily traffic
4,860
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

A Ave over 4th ST & RR is a steel continuous stringer/multi-beam or girder carrying A Ave over 4th ST & RR in Linn County, Iowa. It was built in 1974, so it is 51 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 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 4,860 vehicles a day, projected to reach 4,860 by 2043. The structure is 324 ft (98.8 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesA Ave
Crosses4th ST & RR
Location000000000
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates41.98058, -91.66782
Functional classUrban Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.2 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length324 ft (98.8 m)
Longest span94 ft (28.7 m)
Deck width63 ft (19.2 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,860 (2021)
Projected traffic4,860 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was A Ave over 4th ST & RR built?

It was built in 1974, making it 51 years old in 2025.

What condition is A Ave over 4th ST & RR 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 April 2023.

How much traffic does A Ave over 4th ST & RR carry?

About 4,860 vehicles per day (2021 count).

How long is A Ave over 4th ST & RR?

The structure is 324 ft (98.8 m) long with a longest span of 94 ft (28.7 m) and a deck 63 ft wide.

Who owns A Ave over 4th ST & RR?

It is owned by the City or Municipal Highway Agency.