US Bridges

F 16 120th ST over E Nishnabotna River

Good

Audubon County, Iowa · FM 081351301 · Structure no. 000000000069491

Built
2019
6 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
153 ft
3 main spans
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

F 16 120th ST over E Nishnabotna River is a concrete continuous slab carrying F 16 120th ST over E Nishnabotna River in Audubon County, Iowa. It was built in 2019, so it is 6 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 40 vehicles a day, projected to reach 40 by 2044. The structure is 153 ft (46.6 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesF 16 120th ST
CrossesE Nishnabotna River
LocationFM 081351301
RouteCounty Highway 0
CountyAudubon County
StateIowa
Coordinates41.83453, -94.86623
Functional classRural Major Collector

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 protection9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length153 ft (46.6 m)
Longest span59 ft (18 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2022)
Projected traffic40 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 F 16 120th ST over E Nishnabotna River built?

It was built in 2019, making it 6 years old in 2025.

What condition is F 16 120th ST over E Nishnabotna 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 October 2024.

How much traffic does F 16 120th ST over E Nishnabotna River carry?

About 40 vehicles per day (2022 count).

How long is F 16 120th ST over E Nishnabotna River?

The structure is 153 ft (46.6 m) long with a longest span of 59 ft (18 m) and a deck 27 ft wide.

Who owns F 16 120th ST over E Nishnabotna River?

It is owned by the County Highway Agency.