US Bridges

S.H. 99 over Magnolia Creek

Good

Seminole County, Oklahoma · 1.2 MI N JCT US 270 · Structure no. 164510000000000

Built
1965
60 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
75 ft
4 main spans
Daily traffic
14,400
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 99 over Magnolia Creek is a concrete culvert carrying S.H. 99 over Magnolia Creek in Seminole County, Oklahoma. It was built in 1965, so it is 60 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 14,400 vehicles a day, roughly 7% of them trucks, projected to reach 23,040 by 2042. The structure is 75 ft (22.9 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesS.H. 99
CrossesMagnolia Creek
Location1.2 MI N JCT US 270
RouteState Highway 99
CountySeminole County
StateOklahoma
Coordinates35.24079, -96.67125
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span17 ft (5.2 m)
Deck width38 ft (11.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,400 (2022)
Projected traffic23,040 by 2042
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$1.3 million
NavigationNo navigation control on waterway

Frequently asked questions

When was S.H. 99 over Magnolia Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is S.H. 99 over Magnolia 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 February 2024.

How much traffic does S.H. 99 over Magnolia Creek carry?

About 14,400 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is S.H. 99 over Magnolia Creek?

The structure is 75 ft (22.9 m) long with a longest span of 17 ft (5.2 m) and a deck 38 ft wide.

Who owns S.H. 99 over Magnolia Creek?

It is owned by the State Highway Agency.