US Bridges

Jackman Ave over Big Turkey CR

PoorPosted for load

Benton County, Missouri · S 21 T 39 N R 21 W · Structure no. 21487

Built
1960
65 years old
Condition
Poor
inspected January 2025
Type
Slab
Concrete Continuous
Length
30 ft
4 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

Jackman Ave over Big Turkey CR is a concrete continuous slab carrying Jackman Ave over Big Turkey CR in Benton County, Missouri. It was built in 1960, so it is 65 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 44 by 2043. The structure is 30 ft (9.1 m) long and 12 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesJackman Ave
CrossesBig Turkey CR
LocationS 21 T 39 N R 21 W
RouteCounty Highway 309
CountyBenton County
StateMissouri
Coordinates38.13869, -93.23675
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating17.9 US tons
Inventory rating10.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadOther
Structure length30 ft (9.1 m)
Longest span8 ft (2.4 m)
Deck width12 ft (3.6 m)
Roadway width12 ft (3.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic44 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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$289,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Jackman Ave over Big Turkey CR built?

It was built in 1960, making it 65 years old in 2025.

What condition is Jackman Ave over Big Turkey CR 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 January 2025.

How much traffic does Jackman Ave over Big Turkey CR carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Jackman Ave over Big Turkey CR?

The structure is 30 ft (9.1 m) long with a longest span of 8 ft (2.4 m) and a deck 12 ft wide.

Who owns Jackman Ave over Big Turkey CR?

It is owned by the County Highway Agency.