US Bridges

EB US 20 over Branch Plum Creek

Good

Delaware County, Iowa · 5.0 Mi. E of Jct. Ia 38 · Structure no. 000000000605825

Built
1981
44 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
159 ft
3 main spans
Daily traffic
4,850
2022 count
Owner
State
State Highway Agency

About this bridge

EB US 20 over Branch Plum Creek is a prestressed concrete stringer/multi-beam or girder carrying EB US 20 over Branch Plum Creek in Delaware County, Iowa. It was built in 1981, so it is 44 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,850 vehicles a day, roughly 22% of them trucks, projected to reach 4,850 by 2042. The structure is 159 ft (48.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesEB US 20
CrossesBranch Plum Creek
Location5.0 Mi. E of Jct. Ia 38
RouteU.S. Route 20
StateIowa
Coordinates42.47066, -91.24832
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating43.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length159 ft (48.5 m)
Longest span52 ft (15.9 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,850 (2022)
Projected traffic4,850 by 2042
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 EB US 20 over Branch Plum Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is EB US 20 over Branch Plum Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does EB US 20 over Branch Plum Creek carry?

About 4,850 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is EB US 20 over Branch Plum Creek?

The structure is 159 ft (48.5 m) long with a longest span of 52 ft (15.9 m) and a deck 43 ft wide.

Who owns EB US 20 over Branch Plum Creek?

It is owned by the State Highway Agency.