US Bridges

1390 120th ST over West Branch Iowa River

Good

Hancock County, Iowa · 094242903 · Structure no. 000000000172701

Built
1984
41 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
152 ft
3 main spans
Daily traffic
41
2022 count
Owner
County
County Highway Agency

About this bridge

1390 120th ST over West Branch Iowa River is a concrete continuous slab carrying 1390 120th ST over West Branch Iowa River in Hancock 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 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 41 vehicles a day, projected to reach 41 by 2043. The structure is 152 ft (46.3 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries1390 120th ST
CrossesWest Branch Iowa River
Location094242903
RouteCounty Highway 0
CountyHancock County
StateIowa
Coordinates42.93752, -93.69751
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47 US tons
Inventory rating10.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length152 ft (46.3 m)
Longest span58 ft (17.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41 (2022)
Projected traffic41 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 1390 120th ST over West Branch Iowa River built?

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

What condition is 1390 120th ST over West Branch Iowa 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 April 2023.

How much traffic does 1390 120th ST over West Branch Iowa River carry?

About 41 vehicles per day (2022 count).

How long is 1390 120th ST over West Branch Iowa River?

The structure is 152 ft (46.3 m) long with a longest span of 58 ft (17.7 m) and a deck 26 ft wide.

Who owns 1390 120th ST over West Branch Iowa River?

It is owned by the County Highway Agency.