US Bridges

N3320 Union Street over Highland under

Good

Kay County, Oklahoma · 1N of US60B on Union ST · Structure no. 157660000000000

Built
1963
62 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
149 ft
4 main spans
Daily traffic
2,000
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N3320 Union Street over Highland under is a steel stringer/multi-beam or girder carrying N3320 Union Street over Highland under in Kay County, Oklahoma. It was built in 1963, so it is 62 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,000 vehicles a day, roughly 5% of them trucks, projected to reach 3,200 by 2042. The structure is 149 ft (45.4 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN3320 Union Street
CrossesHighland under
Location1N of US60B on Union ST
RouteCity Street N3320
Coordinates36.70966, -97.08518
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.4 US tons
Inventory rating43.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length149 ft (45.4 m)
Longest span43 ft (13.1 m)
Deck width40 ft (12.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2022)
Projected traffic3,200 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$722,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was N3320 Union Street over Highland under built?

It was built in 1963, making it 62 years old in 2025.

What condition is N3320 Union Street over Highland under 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 November 2024.

How much traffic does N3320 Union Street over Highland under carry?

About 2,000 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is N3320 Union Street over Highland under?

The structure is 149 ft (45.4 m) long with a longest span of 43 ft (13.1 m) and a deck 40 ft wide.

Who owns N3320 Union Street over Highland under?

It is owned by the City or Municipal Highway Agency.