US Bridges

E0450 over Harper Creek

PoorPosted for load

Pawnee County, Oklahoma · .6W .7S of Blackburn · Structure no. 036630000000000

Built
1932
93 years old
Condition
Poor
inspected January 2024
Type
Truss - Thru
Steel
Length
46 ft
1 main span
Daily traffic
24
2022 count
Owner
County
County Highway Agency

About this bridge

E0450 over Harper Creek is a steel truss - thru carrying E0450 over Harper Creek in Pawnee County, Oklahoma. It was built in 1932, so it is 93 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 24 vehicles a day, roughly 10% of them trucks, projected to reach 38 by 2042. The structure is 46 ft (14 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesE0450
CrossesHarper Creek
Location.6W .7S of Blackburn
RouteCounty Highway E0450
Coordinates36.36242, -96.60765
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.8 US tons
Inventory rating14.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24 (2022)
Projected traffic38 by 2042
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was E0450 over Harper Creek built?

It was built in 1932, making it 93 years old in 2025.

What condition is E0450 over Harper 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 2024.

How much traffic does E0450 over Harper Creek carry?

About 24 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is E0450 over Harper Creek?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 16 ft wide.

Who owns E0450 over Harper Creek?

It is owned by the County Highway Agency.