US Bridges

IRR Indian 20 HWY over Delaware River

Fair

Brown County, Kansas · 3.80 MI E US75 · Structure no. 999902000070261

Built
1935
90 years old, rebuilt 2001
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
262 ft
4 main spans
Daily traffic
1,212
2023 count
Owner
State
State Highway Agency

About this bridge

IRR Indian 20 HWY over Delaware River is a steel continuous stringer/multi-beam or girder carrying IRR Indian 20 HWY over Delaware River in Brown County, Kansas. It was built in 1935 and reconstructed in 2001, so it is 90 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,212 vehicles a day, roughly 15% of them trucks, projected to reach 1,236 by 2044. The structure is 262 ft (80 m) long and 28 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesIRR Indian 20 HWY
CrossesDelaware River
Location3.80 MI E US75
RouteState Highway 20
StateKansas
Coordinates39.66722, -95.65972
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.2 US tons
Inventory rating32 US tons

Structure

MaterialSteel Continuous
DeckNot applicable
Main spans4
Design loadH 15
Structure length262 ft (80 m)
Longest span73 ft (22.1 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,212 (2023)
Projected traffic1,236 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 IRR Indian 20 HWY over Delaware River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2001.

What condition is IRR Indian 20 HWY over Delaware River 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 June 2023.

How much traffic does IRR Indian 20 HWY over Delaware River carry?

About 1,212 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is IRR Indian 20 HWY over Delaware River?

The structure is 262 ft (80 m) long with a longest span of 73 ft (22.1 m) and a deck 28 ft wide.

Who owns IRR Indian 20 HWY over Delaware River?

It is owned by the State Highway Agency.