US Bridges

Onaga Road over Mill Creek

GoodPosted for load

Pottawatomie County, Kansas · 0.5S 0.5W of Onaga · Structure no. 000000000750050

Built
1959
66 years old
Condition
Good
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
132 ft
3 main spans
Daily traffic
340
2013 count
Owner
County
County Highway Agency

About this bridge

Onaga Road over Mill Creek is a concrete continuous tee beam carrying Onaga Road over Mill Creek in Pottawatomie County, Kansas. It was built in 1959, so it is 66 years old, older than the Kansas average of 52.8 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. Its operating status is: posted for load restriction.

It carries about 340 vehicles a day, projected to reach 408 by 2043. The structure is 132 ft (40.2 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesOnaga Road
CrossesMill Creek
Location0.5S 0.5W of Onaga
RouteCounty Highway 483
CountyPottawatomie County
StateKansas
Coordinates39.47773, -96.18356
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length132 ft (40.2 m)
Longest span50 ft (15.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic340 (2013)
Projected traffic408 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 Onaga Road over Mill Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Onaga Road over Mill 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 August 2023.

How much traffic does Onaga Road over Mill Creek carry?

About 340 vehicles per day (2013 count).

How long is Onaga Road over Mill Creek?

The structure is 132 ft (40.2 m) long with a longest span of 50 ft (15.2 m) and a deck 27 ft wide.

Who owns Onaga Road over Mill Creek?

It is owned by the County Highway Agency.