US Bridges

E1580 Royal Oaks over I-35 under

Fair

Garvin County, Oklahoma · 5.0 MI N. S.H. 29 · Structure no. 179300000000000

Built
1970
55 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
276 ft
3 main spans
Daily traffic
1,750
2022 count
Owner
State
State Highway Agency

About this bridge

E1580 Royal Oaks over I-35 under is a steel continuous stringer/multi-beam or girder carrying E1580 Royal Oaks over I-35 under in Garvin County, Oklahoma. It was built in 1970, so it is 55 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 1,750 vehicles a day, roughly 13% of them trucks, projected to reach 2,800 by 2042. The structure is 276 ft (84.1 m) long and 34 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesE1580 Royal Oaks
CrossesI-35 under
Location5.0 MI N. S.H. 29
RouteCounty Highway E1580
CountyGarvin County
StateOklahoma
Coordinates34.72465, -97.25433
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length276 ft (84.1 m)
Longest span105 ft (32 m)
Deck width34 ft (10.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,750 (2022)
Projected traffic2,800 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed11.2 mi (18 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
NavigationNot applicable (no waterway)

Frequently asked questions

When was E1580 Royal Oaks over I-35 under built?

It was built in 1970, making it 55 years old in 2025.

What condition is E1580 Royal Oaks over I-35 under 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 January 2023.

How much traffic does E1580 Royal Oaks over I-35 under carry?

About 1,750 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is E1580 Royal Oaks over I-35 under?

The structure is 276 ft (84.1 m) long with a longest span of 105 ft (32 m) and a deck 34 ft wide.

Who owns E1580 Royal Oaks over I-35 under?

It is owned by the State Highway Agency.