US Bridges

420th Ave over Br North English River

Good

Poweshiek County, Iowa · 079160101 · Structure no. 000000000292711

Built
2023
2 years old
Condition
Good
inspected December 2023
Type
Slab
Steel
Length
50 ft
1 main span
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

420th Ave over Br North English River is a steel slab carrying 420th Ave over Br North English River in Poweshiek County, Iowa. It was built in 2023, so it is 2 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, projected to reach 30 by 2043. The structure is 50 ft (15.2 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries420th Ave
CrossesBr North English River
Location079160101
RouteCounty Highway 0
CountyPoweshiek County
StateIowa
Coordinates41.68796, -92.66123
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
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 evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating62.7 US tons
Inventory rating37.6 US tons

Structure

Structure typeSlab
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span49 ft (14.9 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic30 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$30,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 420th Ave over Br North English River built?

It was built in 2023, making it 2 years old in 2025.

What condition is 420th Ave over Br North English River 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 December 2023.

How much traffic does 420th Ave over Br North English River carry?

About 30 vehicles per day (2022 count).

How long is 420th Ave over Br North English River?

The structure is 50 ft (15.2 m) long with a longest span of 49 ft (14.9 m) and a deck 30 ft wide.

Who owns 420th Ave over Br North English River?

It is owned by the County Highway Agency.