US Bridges

X 35 (270th Ave) over US 20

Fair

Delaware County, Iowa · 3.7 Mi. E of Jct. Ia #38 · Structure no. 000000000605730

Built
1987
38 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
248 ft
4 main spans
Daily traffic
1,041
2022 count
Owner
State
State Highway Agency

About this bridge

X 35 (270th Ave) over US 20 is a prestressed concrete stringer/multi-beam or girder carrying X 35 (270th Ave) over US 20 in Delaware County, Iowa. It was built in 1987, so it is 38 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 1,041 vehicles a day, roughly 7% of them trucks, projected to reach 1,041 by 2043. The structure is 248 ft (75.6 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesX 35 (270th Ave)
CrossesUS 20
Location3.7 Mi. E of Jct. Ia #38
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.47098, -91.27234
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating89.7 US tons
Inventory rating43.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length248 ft (75.6 m)
Longest span82 ft (25 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,041 (2022)
Projected traffic1,041 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was X 35 (270th Ave) over US 20 built?

It was built in 1987, making it 38 years old in 2025.

What condition is X 35 (270th Ave) 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 October 2023.

How much traffic does X 35 (270th Ave) over US 20 carry?

About 1,041 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is X 35 (270th Ave) over US 20?

The structure is 248 ft (75.6 m) long with a longest span of 82 ft (25 m) and a deck 43 ft wide.

Who owns X 35 (270th Ave) over US 20?

It is owned by the State Highway Agency.