US Bridges

3100 RD Mile 8 over Onion Creek

FairPosted for load

Montgomery County, Kansas · 1.0W of Jefferson · Structure no. 000000000630377

Built
1966
59 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
157 ft
3 main spans
Daily traffic
111
2010 count
Owner
County
County Highway Agency

About this bridge

3100 RD Mile 8 over Onion Creek is a steel continuous stringer/multi-beam or girder carrying 3100 RD Mile 8 over Onion Creek in Montgomery County, Kansas. It was built in 1966, so it is 59 years old, older than the Kansas average of 52.8 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. Its operating status is: posted for load restriction.

It carries about 111 vehicles a day, projected to reach 133 by 2039. The structure is 157 ft (47.9 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries3100 RD Mile 8
CrossesOnion Creek
Location1.0W of Jefferson
RouteCounty Highway 476
CountyMontgomery County
StateKansas
Coordinates37.10918, -95.78231
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment6: Equal to present minimum criteria
Operating rating35.6 US tons
Inventory rating16.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length157 ft (47.9 m)
Longest span60 ft (18.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic111 (2010)
Projected traffic133 by 2039
Trucks0%
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 3100 RD Mile 8 over Onion Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is 3100 RD Mile 8 over Onion 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 March 2023.

How much traffic does 3100 RD Mile 8 over Onion Creek carry?

About 111 vehicles per day (2010 count).

How long is 3100 RD Mile 8 over Onion Creek?

The structure is 157 ft (47.9 m) long with a longest span of 60 ft (18.2 m) and a deck 26 ft wide.

Who owns 3100 RD Mile 8 over Onion Creek?

It is owned by the County Highway Agency.