US Bridges

S.H. 8 over Tonkawa Creek

Fair

Caddo County, Oklahoma · 1.8 S US62 Anadarko · Structure no. 138990000000000

Built
1957
68 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
181 ft
4 main spans
Daily traffic
2,800
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 8 over Tonkawa Creek is a steel stringer/multi-beam or girder carrying S.H. 8 over Tonkawa Creek in Caddo County, Oklahoma. It was built in 1957, so it is 68 years old, older than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,800 vehicles a day, roughly 15% of them trucks, projected to reach 4,480 by 2042. The structure is 181 ft (55.2 m) long and 31 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesS.H. 8
CrossesTonkawa Creek
Location1.8 S US62 Anadarko
RouteState Highway 8
CountyCaddo County
StateOklahoma
Coordinates35.04656, -98.23384
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length181 ft (55.2 m)
Longest span60 ft (18.3 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2022)
Projected traffic4,480 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

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$2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was S.H. 8 over Tonkawa Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is S.H. 8 over Tonkawa Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does S.H. 8 over Tonkawa Creek carry?

About 2,800 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is S.H. 8 over Tonkawa Creek?

The structure is 181 ft (55.2 m) long with a longest span of 60 ft (18.3 m) and a deck 31 ft wide.

Who owns S.H. 8 over Tonkawa Creek?

It is owned by the State Highway Agency.