US Bridges

Ia 175 over Munns Creek

Fair

Grundy County, Iowa · 0.8 Mile E of JCT SR T47 · Structure no. 000000000025910

Built
1917
108 years old, rebuilt 1958
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
43 ft
1 main span
Daily traffic
1,270
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 175 over Munns Creek is a concrete slab carrying Ia 175 over Munns Creek in Grundy County, Iowa. It was built in 1917 and reconstructed in 1958, so it is 108 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 1,270 vehicles a day, roughly 16% of them trucks, projected to reach 1,270 by 2044. The structure is 43 ft (13.1 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIa 175
CrossesMunns Creek
Location0.8 Mile E of JCT SR T47
RouteState Highway 175
CountyGrundy County
StateIowa
Coordinates42.34932, -92.69471
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 alignment8: Equal to present desirable criteria
Operating rating52.8 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length43 ft (13.1 m)
Longest span40 ft (12.2 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,270 (2022)
Projected traffic1,270 by 2044
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ia 175 over Munns Creek built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 1958.

What condition is Ia 175 over Munns Creek 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 August 2024.

How much traffic does Ia 175 over Munns Creek carry?

About 1,270 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Ia 175 over Munns Creek?

The structure is 43 ft (13.1 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.

Who owns Ia 175 over Munns Creek?

It is owned by the State Highway Agency.