US Bridges

4200 St. 21.0-D.7 over Stream

Good

Allen County, Kansas · 2.7S 1.0E of Mildred · Structure no. 000011057005767

Built
1930
95 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
60
2006 count
Owner
County
County Highway Agency

About this bridge

4200 St. 21.0-D.7 over Stream is a concrete culvert carrying 4200 St. 21.0-D.7 over Stream in Allen County, Kansas. It was built in 1930, so it is 95 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.

It carries about 60 vehicles a day, projected to reach 60 by 2044. The structure is 25 ft (7.6 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries4200 St. 21.0-D.7
CrossesStream
Location2.7S 1.0E of Mildred
RouteCounty Highway 0
CountyAllen County
StateKansas
Coordinates37.98451, -95.15184
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span12 ft (3.6 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic60 (2006)
Projected traffic60 by 2044
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$571,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 4200 St. 21.0-D.7 over Stream built?

It was built in 1930, making it 95 years old in 2025.

What condition is 4200 St. 21.0-D.7 over Stream 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 February 2024.

How much traffic does 4200 St. 21.0-D.7 over Stream carry?

About 60 vehicles per day (2006 count).

How long is 4200 St. 21.0-D.7 over Stream?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.6 m) and a deck 22 ft wide.

Who owns 4200 St. 21.0-D.7 over Stream?

It is owned by the County Highway Agency.