US Bridges

Ia 21 over English River

Fair

Keokuk County, Iowa · 2.3 Mi. N of Jct. Ia. 22 · Structure no. 000000000032631

Built
1984
41 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
1,490
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 21 over English River is a prestressed concrete stringer/multi-beam or girder carrying Ia 21 over English River in Keokuk County, Iowa. It was built in 1984, so it is 41 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 2043. The structure is 150 ft (45.7 m) long and 43 ft wide. If it were closed, the detour would be 70.8 mi (114 km).

Location

Open in Google Maps
CarriesIa 21
CrossesEnglish River
Location2.3 Mi. N of Jct. Ia. 22
RouteState Highway 21
CountyKeokuk County
StateIowa
Coordinates41.48597, -92.35529
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating58.2 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span69 ft (21 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 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.8 mi (114 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 English River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Ia 21 over 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 October 2023.

How much traffic does Ia 21 over English River carry?

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

How long is Ia 21 over English River?

The structure is 150 ft (45.7 m) long with a longest span of 69 ft (21 m) and a deck 43 ft wide.

Who owns Ia 21 over English River?

It is owned by the State Highway Agency.