US Bridges

Historic RTE 66 over Turnback CR

FairPosted for load

Lawrence County, Missouri · S 29 T 29 N R 25 W · Structure no. 20730

Built
1923
102 years old
Condition
Fair
inspected March 2023
Type
Truss - Thru
Steel
Length
216 ft
3 main spans
Daily traffic
500
2023 count
Owner
County
County Highway Agency

About this bridge

Historic RTE 66 over Turnback CR is a steel truss - thru carrying Historic RTE 66 over Turnback CR in Lawrence County, Missouri. It was built in 1923, so it is 102 years old, older than the Missouri average of 45.1 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 500 vehicles a day, roughly 10% of them trucks, projected to reach 700 by 2043. The structure is 216 ft (65.8 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHistoric RTE 66
CrossesTurnback CR
LocationS 29 T 29 N R 25 W
RouteCounty Highway 272
CountyLawrence County
StateMissouri
Coordinates37.19236, -93.6881
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11.9 US tons
Inventory rating7.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length216 ft (65.8 m)
Longest span70 ft (21.3 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic700 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.4 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Historic RTE 66 over Turnback CR built?

It was built in 1923, making it 102 years old in 2025.

What condition is Historic RTE 66 over Turnback CR 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 March 2023.

How much traffic does Historic RTE 66 over Turnback CR carry?

About 500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Historic RTE 66 over Turnback CR?

The structure is 216 ft (65.8 m) long with a longest span of 70 ft (21.3 m) and a deck 21 ft wide.

Who owns Historic RTE 66 over Turnback CR?

It is owned by the County Highway Agency.