US Bridges

Local RD 21.1-I.0 over Marmaton River

PoorPosted for load

Allen County, Kansas · 0.5N 1.0E of Moran · Structure no. 000011057105860

Built
1940
85 years old
Condition
Poor
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
2 main spans
Daily traffic
50
2006 count
Owner
County
County Highway Agency

About this bridge

Local RD 21.1-I.0 over Marmaton River is a steel stringer/multi-beam or girder carrying Local RD 21.1-I.0 over Marmaton River in Allen County, Kansas. It was built in 1940, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 55 by 2044. The structure is 28 ft (8.5 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLocal RD 21.1-I.0
CrossesMarmaton River
Location0.5N 1.0E of Moran
RouteCounty Highway 0
CountyAllen County
StateKansas
Coordinates37.92152, -95.15031
Functional classRural Local

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 alignment6: Equal to present minimum criteria
Operating rating18.8 US tons
Inventory rating11.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span12 ft (3.6 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic50 (2006)
Projected traffic55 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$100,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Local RD 21.1-I.0 over Marmaton River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Local RD 21.1-I.0 over Marmaton River 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 January 2024.

How much traffic does Local RD 21.1-I.0 over Marmaton River carry?

About 50 vehicles per day (2006 count).

How long is Local RD 21.1-I.0 over Marmaton River?

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.6 m) and a deck 22 ft wide.

Who owns Local RD 21.1-I.0 over Marmaton River?

It is owned by the County Highway Agency.