US Bridges

350th ST over Waterman Creek

Good

O'Brien County, Iowa · Waterman Creek @ 350th ST · Structure no. 000000000260651

Built
2017
8 years old
Condition
Good
inspected May 2022
Type
Slab
Concrete
Length
133 ft
3 main spans
Daily traffic
72
2022 count
Owner
County
County Highway Agency

About this bridge

350th ST over Waterman Creek is a concrete slab carrying 350th ST over Waterman Creek in O'Brien County, Iowa. It was built in 2017, so it is 8 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 72 vehicles a day, projected to reach 72 by 2043. The structure is 133 ft (40.5 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries350th ST
CrossesWaterman Creek
LocationWaterman Creek @ 350th ST
RouteCounty Highway 0
StateIowa
Coordinates43.14253, -95.48953
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length133 ft (40.5 m)
Longest span51 ft (15.5 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72 (2022)
Projected traffic72 by 2043
Trucks0%
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

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 ST over Waterman Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is 350th ST over Waterman 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 May 2022.

How much traffic does 350th ST over Waterman Creek carry?

About 72 vehicles per day (2022 count).

How long is 350th ST over Waterman Creek?

The structure is 133 ft (40.5 m) long with a longest span of 51 ft (15.5 m) and a deck 33 ft wide.

Who owns 350th ST over Waterman Creek?

It is owned by the County Highway Agency.