US Bridges

Ia 21 over North English River

Fair

Poweshiek County, Iowa · 3.5 Mi. S of Jct. I-80 · Structure no. 000000000045910

Built
1962
63 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
183 ft
3 main spans
Daily traffic
1,730
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 21 over North English River is a prestressed concrete stringer/multi-beam or girder carrying Ia 21 over North English River in Poweshiek County, Iowa. It was built in 1962, so it is 63 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 1,730 vehicles a day, roughly 14% of them trucks, projected to reach 1,730 by 2044. The structure is 183 ft (55.8 m) long and 36 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 21
CrossesNorth English River
Location3.5 Mi. S of Jct. I-80
RouteState Highway 21
CountyPoweshiek County
StateIowa
Coordinates41.64483, -92.35804
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.9 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length183 ft (55.8 m)
Longest span69 ft (21 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,730 (2022)
Projected traffic1,730 by 2044
Trucks14%
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 North English River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Ia 21 over North 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 North English River carry?

About 1,730 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Ia 21 over North English River?

The structure is 183 ft (55.8 m) long with a longest span of 69 ft (21 m) and a deck 36 ft wide.

Who owns Ia 21 over North English River?

It is owned by the State Highway Agency.