US Bridges

US 20 EB over SR D20 & UP RR

Fair

Webster County, Iowa · 0.5 MI E of JCT SR D36 · Structure no. 000000000606070

Built
1990
35 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
410 ft
4 main spans
Daily traffic
3,300
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 EB over SR D20 & UP RR is a steel continuous stringer/multi-beam or girder carrying US 20 EB over SR D20 & UP RR in Webster County, Iowa. It was built in 1990, so it is 35 years old, younger 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 3,300 vehicles a day, roughly 34% of them trucks, projected to reach 3,300 by 2042. The structure is 410 ft (125 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 20 EB
CrossesSR D20 & UP RR
Location0.5 MI E of JCT SR D36
RouteU.S. Route 20
StateIowa
Coordinates42.45182, -94.2777
Functional classRural Principal Arterial - Other

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 inspectionJune 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 alignment6: Equal to present minimum criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length410 ft (125 m)
Longest span125 ft (38.1 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2022)
Projected traffic3,300 by 2042
Trucks34%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 EB over SR D20 & UP RR built?

It was built in 1990, making it 35 years old in 2025.

What condition is US 20 EB over SR D20 & UP 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 June 2023.

How much traffic does US 20 EB over SR D20 & UP RR carry?

About 3,300 vehicles per day (2022 count), of which roughly 34% are trucks.

How long is US 20 EB over SR D20 & UP RR?

The structure is 410 ft (125 m) long with a longest span of 125 ft (38.1 m) and a deck 47 ft wide.

Who owns US 20 EB over SR D20 & UP RR?

It is owned by the State Highway Agency.