US Bridges

S.H. 66 over Slwc R.R. under

Poor

Lincoln County, Oklahoma · SH 66; 0.9 MI E JCT SH 18 · Structure no. 017510000000000

Built
1926
99 years old, rebuilt 1956
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
111 ft
3 main spans
Daily traffic
7,800
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 66 over Slwc R.R. under is a steel stringer/multi-beam or girder carrying S.H. 66 over Slwc R.R. under in Lincoln County, Oklahoma. It was built in 1926 and reconstructed in 1956, so it is 99 years old, older than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 7,800 vehicles a day, roughly 15% of them trucks, projected to reach 12,480 by 2042. The structure is 111 ft (33.8 m) long and 34 ft wide. If it were closed, the detour would be 44.1 mi (71 km).

Location

Open in Google Maps
CarriesS.H. 66
CrossesSlwc R.R. under
LocationSH 66; 0.9 MI E JCT SH 18
RouteState Highway 66
CountyLincoln County
StateOklahoma
Coordinates35.70689, -96.8796
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length111 ft (33.8 m)
Longest span36 ft (11 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,800 (2022)
Projected traffic12,480 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed44.1 mi (71 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.8 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was S.H. 66 over Slwc R.R. under built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1956.

What condition is S.H. 66 over Slwc R.R. under in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does S.H. 66 over Slwc R.R. under carry?

About 7,800 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is S.H. 66 over Slwc R.R. under?

The structure is 111 ft (33.8 m) long with a longest span of 36 ft (11 m) and a deck 34 ft wide.

Who owns S.H. 66 over Slwc R.R. under?

It is owned by the State Highway Agency.