US Bridges

3425 RD Mile 21 over Big Hill Creek

Poor

Montgomery County, Kansas · 0.3E of Liberty · Structure no. 000000000630540

Built
1956
69 years old
Condition
Poor
inspected March 2023
Type
Tee Beam
Concrete Continuous
Length
267 ft
4 main spans
Daily traffic
516
2010 count
Owner
County
County Highway Agency

About this bridge

3425 RD Mile 21 over Big Hill Creek is a concrete continuous tee beam carrying 3425 RD Mile 21 over Big Hill Creek in Montgomery County, Kansas. It was built in 1956, so it is 69 years old, older than the Kansas average of 52.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 516 vehicles a day, roughly 3% of them trucks, projected to reach 619 by 2039. The structure is 267 ft (81.4 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries3425 RD Mile 21
CrossesBig Hill Creek
Location0.3E of Liberty
RouteCounty Highway 818
CountyMontgomery County
StateKansas
Coordinates37.15494, -95.58598
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.4 US tons
Inventory rating25.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length267 ft (81.4 m)
Longest span77 ft (23.4 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 traffic516 (2010)
Projected traffic619 by 2039
Trucks3%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 3425 RD Mile 21 over Big Hill Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is 3425 RD Mile 21 over Big Hill Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does 3425 RD Mile 21 over Big Hill Creek carry?

About 516 vehicles per day (2010 count), of which roughly 3% are trucks.

How long is 3425 RD Mile 21 over Big Hill Creek?

The structure is 267 ft (81.4 m) long with a longest span of 77 ft (23.4 m) and a deck 26 ft wide.

Who owns 3425 RD Mile 21 over Big Hill Creek?

It is owned by the County Highway Agency.