US Bridges

1620C over Big Sandy Creek

FairPosted for load

Comanche County, Oklahoma · 1.1 MI W Indiahoma · Structure no. 031830000000000

Built
1930
95 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
130 ft
3 main spans
Daily traffic
321
2022 count
Owner
County
County Highway Agency

About this bridge

1620C over Big Sandy Creek is a steel stringer/multi-beam or girder carrying 1620C over Big Sandy Creek in Comanche County, Oklahoma. It was built in 1930, so it is 95 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 5 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 321 vehicles a day, roughly 15% of them trucks, projected to reach 514 by 2042. The structure is 130 ft (39.6 m) long and 25 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries1620C
CrossesBig Sandy Creek
Location1.1 MI W Indiahoma
RouteCounty Highway 1620C
CountyComanche County
StateOklahoma
Coordinates34.62292, -98.77291
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length130 ft (39.6 m)
Longest span43 ft (13.1 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic321 (2022)
Projected traffic514 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$584,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 1620C over Big Sandy Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is 1620C over Big Sandy 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 1620C over Big Sandy Creek carry?

About 321 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is 1620C over Big Sandy Creek?

The structure is 130 ft (39.6 m) long with a longest span of 43 ft (13.1 m) and a deck 25 ft wide.

Who owns 1620C over Big Sandy Creek?

It is owned by the County Highway Agency.