120th ST over Otter Creek

Good

Osceola County, Iowa · 100412001 · Structure no. 000000000263721

Built: 2011; 14 years old
Condition: Good; inspected November 2024
Type: Culvert; Concrete
Length: 28 ft; 2 main spans
Daily traffic: 15; 2022 count
Owner: County; County Highway Agency

About this bridge

120th ST over Otter Creek is a concrete culvert carrying 120th ST over Otter Creek in Osceola County, Iowa. It was built in 2011, so it is 14 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, projected to reach 15 by 2044. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps

Carries120th ST

CrossesOtter Creek

Location100412001

RouteCounty Highway 0

CountyOsceola County

StateIowa

Coordinates43.47617, -95.71499

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.

Component	Rating	Meaning
Channel and channel protection	7 Good	Some minor problems.
Culvert	8 Very Good	No problems noted.

Last inspectionNovember 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation8: Equal to present desirable criteria

Waterway adequacy9: Superior to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating46.4 US tons

Inventory rating35.7 US tons

Structure

Structure typeCulvert

MaterialConcrete

DeckNot applicable

Main spans2

Design loadHS 20

Structure length28 ft (8.5 m)

Longest span12 ft (3.7 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)

Projected traffic15 by 2044

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 proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was 120th ST over Otter Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is 120th ST over Otter Creek 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 November 2024.

How much traffic does 120th ST over Otter Creek carry?

About 15 vehicles per day (2022 count).

How long is 120th ST over Otter Creek?

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.7 m).

Who owns 120th ST over Otter Creek?

It is owned by the County Highway Agency.