US Bridges

S 3rd ST over US 20

Fair

Delaware County, Iowa · 1.2 Mi. E of Jct. Ia 13 · Structure no. 000000000602010

Built
1974
51 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
313 ft
4 main spans
Daily traffic
959
2021 count
Owner
State
State Highway Agency

About this bridge

S 3rd ST over US 20 is a steel continuous stringer/multi-beam or girder carrying S 3rd ST over US 20 in Delaware 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 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 959 vehicles a day, projected to reach 959 by 2043. The structure is 313 ft (95.4 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesS 3rd ST
CrossesUS 20
Location1.2 Mi. E of Jct. Ia 13
RouteCity Street 0
CountyDelaware County
StateIowa
Coordinates42.4683, -91.45559
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating46.5 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length313 ft (95.4 m)
Longest span96 ft (29.3 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic959 (2021)
Projected traffic959 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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 S 3rd ST over US 20 built?

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

What condition is S 3rd ST 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 May 2023.

How much traffic does S 3rd ST over US 20 carry?

About 959 vehicles per day (2021 count).

How long is S 3rd ST over US 20?

The structure is 313 ft (95.4 m) long with a longest span of 96 ft (29.3 m) and a deck 33 ft wide.

Who owns S 3rd ST over US 20?

It is owned by the State Highway Agency.