US Bridges

N3520 over Black Bear Creek

Good

Pawnee County, Oklahoma · 3.3 Miles South of Skedee · Structure no. 286430000000000

Built
2008
17 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
188 ft
3 main spans
Daily traffic
150
2022 count
Owner
County
County Highway Agency

About this bridge

N3520 over Black Bear Creek is a prestressed concrete stringer/multi-beam or girder carrying N3520 over Black Bear Creek in Pawnee County, Oklahoma. It was built in 2008, so it is 17 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 150 vehicles a day, roughly 10% of them trucks, projected to reach 240 by 2042. The structure is 188 ft (57.2 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesN3520
CrossesBlack Bear Creek
Location3.3 Miles South of Skedee
RouteCounty Highway N3520
Coordinates36.33056, -96.72861
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.9 US tons
Inventory rating43.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length188 ft (57.2 m)
Longest span75 ft (22.9 m)
Deck width29 ft (8.7 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic240 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was N3520 over Black Bear Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is N3520 over Black Bear Creek 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 July 2023.

How much traffic does N3520 over Black Bear Creek carry?

About 150 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N3520 over Black Bear Creek?

The structure is 188 ft (57.2 m) long with a longest span of 75 ft (22.9 m) and a deck 29 ft wide.

Who owns N3520 over Black Bear Creek?

It is owned by the County Highway Agency.