US Bridges

N4605 over Spring Creek

PoorPosted for load

Delaware County, Oklahoma · In Kansas Okla · Structure no. 015360000000000

Built
1925
100 years old
Condition
Poor
inspected January 2023
Type
Slab
Concrete
Length
48 ft
4 main spans
Daily traffic
250
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N4605 over Spring Creek is a concrete slab carrying N4605 over Spring Creek in Delaware County, Oklahoma. It was built in 1925, so it is 100 years old, older than the Oklahoma average of 47.8 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 250 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 48 ft (14.6 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesN4605
CrossesSpring Creek
LocationIn Kansas Okla
RouteCounty Highway N4605
Coordinates36.2063, -94.80388
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating34.3 US tons
Inventory rating20.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length48 ft (14.6 m)
Longest span10 ft (3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2022)
Projected traffic160 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$346,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N4605 over Spring Creek built?

It was built in 1925, making it 100 years old in 2025.

What condition is N4605 over Spring 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 January 2023.

How much traffic does N4605 over Spring Creek carry?

About 250 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N4605 over Spring Creek?

The structure is 48 ft (14.6 m) long with a longest span of 10 ft (3 m) and a deck 28 ft wide.

Who owns N4605 over Spring Creek?

It is owned by the City or Municipal Highway Agency.