US Bridges

1686C over Post Oak Creek

FairPosted for load

Comanche County, Oklahoma · 5.9 MI S Indiahoma · Structure no. 212060000000000

Built
1986
39 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete
Length
63 ft
3 main spans
Daily traffic
62
2022 count
Owner
County
County Highway Agency

About this bridge

1686C over Post Oak Creek is a concrete culvert carrying 1686C over Post Oak Creek in Comanche County, Oklahoma. It was built in 1986, so it is 39 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 62 vehicles a day, roughly 15% of them trucks, projected to reach 99 by 2042. The structure is 63 ft (19.2 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries1686C
CrossesPost Oak Creek
Location5.9 MI S Indiahoma
RouteCounty Highway 1629
CountyComanche County
StateOklahoma
Coordinates34.53718, -98.75576
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length63 ft (19.2 m)
Longest span24 ft (7.3 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2022)
Projected traffic99 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 1686C over Post Oak Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is 1686C over Post Oak 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 August 2023.

How much traffic does 1686C over Post Oak Creek carry?

About 62 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is 1686C over Post Oak Creek?

The structure is 63 ft (19.2 m) long with a longest span of 24 ft (7.3 m) and a deck 32 ft wide.

Who owns 1686C over Post Oak Creek?

It is owned by the County Highway Agency.