US Bridges

Local 420th ST over Creek

Fair

Cherokee County, Iowa · 093410601 · Structure no. 000000000109710

Built
1966
59 years old, rebuilt 2020
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
45 ft
1 main span
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

Local 420th ST over Creek is a steel stringer/multi-beam or girder carrying Local 420th ST over Creek in Cherokee County, Iowa. It was built in 1966 and reconstructed in 2020, so it is 59 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 30 vehicles a day, projected to reach 30 by 2043. The structure is 45 ft (13.7 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLocal 420th ST
CrossesCreek
Location093410601
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.90974, -95.72838
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating29.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length45 ft (13.7 m)
Longest span43 ft (13.1 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 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$743,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local 420th ST over Creek built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2020.

What condition is Local 420th ST over Creek 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 August 2023.

How much traffic does Local 420th ST over Creek carry?

About 30 vehicles per day (2022 count).

How long is Local 420th ST over Creek?

The structure is 45 ft (13.7 m) long with a longest span of 43 ft (13.1 m) and a deck 26 ft wide.

Who owns Local 420th ST over Creek?

It is owned by the County Highway Agency.