US Bridges

1st Ave S over 21st ST & RR

Fair

Webster County, Iowa · 089282000 · Structure no. 000000000005040

Built
1968
57 years old, rebuilt 1978
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,044 ft
17 main spans
Daily traffic
9,860
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

1st Ave S over 21st ST & RR is a prestressed concrete stringer/multi-beam or girder carrying 1st Ave S over 21st ST & RR in Webster County, Iowa. It was built in 1968 and reconstructed in 1978, so it is 57 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 9,860 vehicles a day, projected to reach 9,860 by 2044. The structure is 1,044 ft (318.2 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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Carries1st Ave S
Crosses21st ST & RR
Location089282000
RouteCity Street 0
CountyWebster County
StateIowa
Coordinates42.50519, -94.16963
Functional classUrban Minor 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.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating62.2 US tons
Inventory rating37.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans17
Design loadHS 20
Structure length1,044 ft (318.2 m)
Longest span69 ft (21 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,860 (2021)
Projected traffic9,860 by 2044
Trucks0%
Lanes on structure2
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$40,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was 1st Ave S over 21st ST & RR built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1978.

What condition is 1st Ave S over 21st 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 2024.

How much traffic does 1st Ave S over 21st ST & RR carry?

About 9,860 vehicles per day (2021 count).

How long is 1st Ave S over 21st ST & RR?

The structure is 1,044 ft (318.2 m) long with a longest span of 69 ft (21 m) and a deck 39 ft wide.

Who owns 1st Ave S over 21st ST & RR?

It is owned by the City or Municipal Highway Agency.