US Bridges

FM 170th ST over Bohemian Creek

PoorPosted for load

Howard County, Iowa · 098113401 · Structure no. 000000000182150

Built
1959
66 years old
Condition
Poor
inspected April 2023
Type
Channel Beam
Concrete
Length
34 ft
1 main span
Daily traffic
80
2021 count
Owner
County
County Highway Agency

About this bridge

FM 170th ST over Bohemian Creek is a concrete channel beam carrying FM 170th ST over Bohemian Creek in Howard County, Iowa. It was built in 1959, so it is 66 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 80 vehicles a day, projected to reach 80 by 2043. The structure is 34 ft (10.4 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM 170th ST
CrossesBohemian Creek
Location098113401
RouteCounty Highway 0
CountyHoward County
StateIowa
Coordinates43.27012, -92.12929
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating32.7 US tons
Inventory rating19.5 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length34 ft (10.4 m)
Longest span28 ft (8.5 m)
Deck width22 ft (6.6 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2021)
Projected traffic80 by 2043
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 170th ST over Bohemian Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is FM 170th ST over Bohemian Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does FM 170th ST over Bohemian Creek carry?

About 80 vehicles per day (2021 count).

How long is FM 170th ST over Bohemian Creek?

The structure is 34 ft (10.4 m) long with a longest span of 28 ft (8.5 m) and a deck 22 ft wide.

Who owns FM 170th ST over Bohemian Creek?

It is owned by the County Highway Agency.