US Bridges

FM 120th ST over Wapsipinicon River

Fair

Bremer County, Iowa · 093121801 · Structure no. 000000000015800

Built
1950
75 years old, rebuilt 2005
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
322 ft
5 main spans
Daily traffic
393
2022 count
Owner
County
County Highway Agency

About this bridge

FM 120th ST over Wapsipinicon River is a steel continuous stringer/multi-beam or girder carrying FM 120th ST over Wapsipinicon River in Bremer County, Iowa. It was built in 1950 and reconstructed in 2005, so it is 75 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 5 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 393 vehicles a day, roughly 15% of them trucks, projected to reach 393 by 2044. The structure is 322 ft (98.1 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesFM 120th ST
CrossesWapsipinicon River
Location093121801
RouteCounty Highway 0
CountyBremer County
StateIowa
Coordinates42.87679, -92.31129
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61 US tons
Inventory rating36.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length322 ft (98.1 m)
Longest span70 ft (21.3 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic393 (2022)
Projected traffic393 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 FM 120th ST over Wapsipinicon River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2005.

What condition is FM 120th ST over Wapsipinicon River 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 April 2024.

How much traffic does FM 120th ST over Wapsipinicon River carry?

About 393 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM 120th ST over Wapsipinicon River?

The structure is 322 ft (98.1 m) long with a longest span of 70 ft (21.3 m) and a deck 33 ft wide.

Who owns FM 120th ST over Wapsipinicon River?

It is owned by the County Highway Agency.