US Bridges

350th Ave over Brophy Creek

Fair

Clinton County, Iowa · 081E52002 · Structure no. 000000000122650

Built
1964
61 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
225 ft
5 main spans
Daily traffic
460
2022 count
Owner
County
County Highway Agency

About this bridge

350th Ave over Brophy Creek is a concrete continuous slab carrying 350th Ave over Brophy Creek in Clinton County, Iowa. It was built in 1964, so it is 61 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 6 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 460 vehicles a day, roughly 12% of them trucks, projected to reach 460 by 2044. The structure is 225 ft (68.6 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries350th Ave
CrossesBrophy Creek
Location081E52002
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates41.80322, -90.41321
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating57.5 US tons
Inventory rating33.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length225 ft (68.6 m)
Longest span49 ft (14.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic460 (2022)
Projected traffic460 by 2044
Trucks12%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 350th Ave over Brophy Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is 350th Ave over Brophy 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 February 2024.

How much traffic does 350th Ave over Brophy Creek carry?

About 460 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is 350th Ave over Brophy Creek?

The structure is 225 ft (68.6 m) long with a longest span of 49 ft (14.9 m) and a deck 30 ft wide.

Who owns 350th Ave over Brophy Creek?

It is owned by the County Highway Agency.