US Bridges

FM-175th Street over Show Creek

PoorPosted for load

Adams County, Iowa · 072351105 · Structure no. 000000000060110

Built
1961
64 years old
Condition
Poor
inspected January 2024
Type
Slab
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
199
2022 count
Owner
County
County Highway Agency

About this bridge

FM-175th Street over Show Creek is a concrete continuous slab carrying FM-175th Street over Show Creek in Adams County, Iowa. It was built in 1961, so it is 64 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 199 vehicles a day, roughly 17% of them trucks, projected to reach 199 by 2044. The structure is 102 ft (31.1 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesFM-175th Street
CrossesShow Creek
Location072351105
RouteCounty Highway 0
StateIowa
Coordinates41.05197, -94.84506
Functional classRural Major 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating23.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length102 ft (31.1 m)
Longest span39 ft (11.9 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic199 (2022)
Projected traffic199 by 2044
Trucks17%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM-175th Street over Show Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is FM-175th Street over Show 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 January 2024.

How much traffic does FM-175th Street over Show Creek carry?

About 199 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is FM-175th Street over Show Creek?

The structure is 102 ft (31.1 m) long with a longest span of 39 ft (11.9 m) and a deck 28 ft wide.

Who owns FM-175th Street over Show Creek?

It is owned by the County Highway Agency.