US Bridges

US 20 EB over 205th Ave Spring Branch

Fair

Delaware County, Iowa · 2.8 Mi. W of Jct. Ia 38 · Structure no. 000000000602030

Built
1973
52 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
290 ft
4 main spans
Daily traffic
4,250
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 EB over 205th Ave Spring Branch is a prestressed concrete stringer/multi-beam or girder carrying US 20 EB over 205th Ave Spring Branch in Delaware County, Iowa. It was built in 1973, so it is 52 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 4,250 vehicles a day, roughly 28% of them trucks, projected to reach 4,250 by 2043. The structure is 290 ft (88.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 EB
Crosses205th Ave Spring Branch
Location2.8 Mi. W of Jct. Ia 38
RouteU.S. Route 20
CountyDelaware County
StateIowa
Coordinates42.47084, -91.40111
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating74.5 US tons
Inventory rating30.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length290 ft (88.4 m)
Longest span92 ft (28 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,250 (2022)
Projected traffic4,250 by 2043
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 EB over 205th Ave Spring Branch built?

It was built in 1973, making it 52 years old in 2025.

What condition is US 20 EB over 205th Ave Spring Branch 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 December 2023.

How much traffic does US 20 EB over 205th Ave Spring Branch carry?

About 4,250 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is US 20 EB over 205th Ave Spring Branch?

The structure is 290 ft (88.4 m) long with a longest span of 92 ft (28 m) and a deck 44 ft wide.

Who owns US 20 EB over 205th Ave Spring Branch?

It is owned by the State Highway Agency.