US Bridges

Ia 21 over Tributary English River

Fair

Poweshiek County, Iowa · 3.1 Mi. S of Ia 85 · Structure no. 000000000045881

Built
1985
40 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
113 ft
3 main spans
Daily traffic
1,490
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 21 over Tributary English River is a concrete continuous slab carrying Ia 21 over Tributary English River in Poweshiek County, Iowa. It was built in 1985, so it is 40 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 1,490 vehicles a day, roughly 17% of them trucks, projected to reach 1,490 by 2044. The structure is 113 ft (34.4 m) long and 43 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 21
CrossesTributary English River
Location3.1 Mi. S of Ia 85
RouteState Highway 21
CountyPoweshiek County
StateIowa
Coordinates41.53175, -92.35566
Functional classRural Minor Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating93 US tons
Inventory rating55 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span43 ft (13.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,490 (2022)
Projected traffic1,490 by 2044
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 21 over Tributary English River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Ia 21 over Tributary English River 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 2024.

How much traffic does Ia 21 over Tributary English River carry?

About 1,490 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is Ia 21 over Tributary English River?

The structure is 113 ft (34.4 m) long with a longest span of 43 ft (13.1 m) and a deck 43 ft wide.

Who owns Ia 21 over Tributary English River?

It is owned by the State Highway Agency.