US Bridges

SR W-40 over US 20

Fair

Buchanan County, Iowa · At Jct. SR W40 · Structure no. 000000000603650

Built
1978
47 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
267 ft
4 main spans
Daily traffic
4,174
2022 count
Owner
State
State Highway Agency

About this bridge

SR W-40 over US 20 is a prestressed concrete stringer/multi-beam or girder carrying SR W-40 over US 20 in Buchanan County, Iowa. It was built in 1978, so it is 47 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 4,174 vehicles a day, roughly 6% of them trucks, projected to reach 4,174 by 2043. The structure is 267 ft (81.4 m) long and 64 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR W-40
CrossesUS 20
LocationAt Jct. SR W40
RouteCounty Highway 0
CountyBuchanan County
StateIowa
Coordinates42.46126, -91.75334
Functional classRural Major 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating82.8 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length267 ft (81.4 m)
Longest span92 ft (28 m)
Deck width64 ft (19.4 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,174 (2022)
Projected traffic4,174 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR W-40 over US 20 built?

It was built in 1978, making it 47 years old in 2025.

What condition is SR W-40 over US 20 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 January 2023.

How much traffic does SR W-40 over US 20 carry?

About 4,174 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is SR W-40 over US 20?

The structure is 267 ft (81.4 m) long with a longest span of 92 ft (28 m) and a deck 64 ft wide.

Who owns SR W-40 over US 20?

It is owned by the State Highway Agency.