US Bridges

N1684 over Red River

Good

Harmon County, Oklahoma · Okla-Texas State Line · Structure no. 304050000000000

Built
2013
12 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,453 ft
10 main spans
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

N1684 over Red River is a prestressed concrete stringer/multi-beam or girder carrying N1684 over Red River in Harmon County, Oklahoma. It was built in 2013, so it is 12 years old, younger 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 50 vehicles a day, roughly 15% of them trucks, projected to reach 80 by 2042. The structure is 1,453 ft (442.9 m) long and 34 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesN1684
CrossesRed River
LocationOkla-Texas State Line
RouteCounty Highway N1684
Coordinates34.58016, -99.95846
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans10
Design loadHL 93
Structure length1,453 ft (442.9 m)
Longest span143 ft (43.6 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic80 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was N1684 over Red River built?

It was built in 2013, making it 12 years old in 2025.

What condition is N1684 over Red River 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 N1684 over Red River carry?

About 50 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is N1684 over Red River?

The structure is 1,453 ft (442.9 m) long with a longest span of 143 ft (43.6 m) and a deck 34 ft wide.

Who owns N1684 over Red River?

It is owned by the County Highway Agency.