US Bridges

SW 21st over Shunganunga Cr.

Good

Shawnee County, Kansas · 252M W. of 21st & Topeka. · Structure no. 427950895390I9A

Built
1981
44 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete Continuous
Length
149 ft
3 main spans
Daily traffic
15,160
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

SW 21st over Shunganunga Cr. is a concrete continuous slab carrying SW 21st over Shunganunga Cr. in Shawnee County, Kansas. It was built in 1981, so it is 44 years old, younger 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.

It carries about 15,160 vehicles a day, roughly 2% of them trucks, projected to reach 19,150 by 2043. The structure is 149 ft (45.3 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSW 21st
CrossesShunganunga Cr.
Location252M W. of 21st & Topeka.
RouteCity Street 5390
CountyShawnee County
StateKansas
Coordinates39.02971, -95.68562
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.3 US tons
Inventory rating45.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length149 ft (45.3 m)
Longest span58 ft (17.6 m)
Deck width64 ft (19.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic15,160 (2017)
Projected traffic19,150 by 2043
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$1,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SW 21st over Shunganunga Cr. built?

It was built in 1981, making it 44 years old in 2025.

What condition is SW 21st over Shunganunga Cr. 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 October 2023.

How much traffic does SW 21st over Shunganunga Cr. carry?

About 15,160 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is SW 21st over Shunganunga Cr.?

The structure is 149 ft (45.3 m) long with a longest span of 58 ft (17.6 m) and a deck 64 ft wide.

Who owns SW 21st over Shunganunga Cr.?

It is owned by the City or Municipal Highway Agency.