US Bridges

Ia 175 over Mosquito Creek

Good

Grundy County, Iowa · 1.2 Miles W of JCT SR T65 · Structure no. 000000000025931

Built
1977
48 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete Continuous
Length
134 ft
3 main spans
Daily traffic
1,850
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 175 over Mosquito Creek is a concrete continuous slab carrying Ia 175 over Mosquito Creek in Grundy County, Iowa. It was built in 1977, so it is 48 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,850 vehicles a day, roughly 11% of them trucks, projected to reach 1,850 by 2042. The structure is 134 ft (40.7 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIa 175
CrossesMosquito Creek
Location1.2 Miles W of JCT SR T65
RouteState Highway 175
CountyGrundy County
StateIowa
Coordinates42.32576, -92.61513
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating63.1 US tons
Inventory rating37.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.7 m)
Longest span51 ft (15.5 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2022)
Projected traffic1,850 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Mosquito Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Ia 175 over Mosquito Creek 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 March 2023.

How much traffic does Ia 175 over Mosquito Creek carry?

About 1,850 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Ia 175 over Mosquito Creek?

The structure is 134 ft (40.7 m) long with a longest span of 51 ft (15.5 m) and a deck 43 ft wide.

Who owns Ia 175 over Mosquito Creek?

It is owned by the State Highway Agency.