US Bridges

County RD S-142 over Slagle CR

PoorPosted for load

Polk County, Missouri · S 17 T 32 N R 22 W · Structure no. 21856

Built
1900
125 years old
Condition
Poor
inspected April 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
20
2024 count
Owner
County
County Highway Agency

About this bridge

County RD S-142 over Slagle CR is a concrete culvert carrying County RD S-142 over Slagle CR in Polk County, Missouri. It was built in 1900, so it is 125 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 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. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, roughly 10% of them trucks, projected to reach 29 by 2044. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCounty RD S-142
CrossesSlagle CR
LocationS 17 T 32 N R 22 W
RouteCounty Highway 327
CountyPolk County
StateMissouri
Coordinates37.49943, -93.37119
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.8 US tons
Inventory rating9.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadOther
Structure length32 ft (9.8 m)
Longest span11 ft (3.4 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2024)
Projected traffic29 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$225,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD S-142 over Slagle CR built?

It was built in 1900, making it 125 years old in 2025.

What condition is County RD S-142 over Slagle 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 April 2024.

How much traffic does County RD S-142 over Slagle CR carry?

About 20 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD S-142 over Slagle CR?

The structure is 32 ft (9.8 m) long with a longest span of 11 ft (3.4 m) and a deck 22 ft wide.

Who owns County RD S-142 over Slagle CR?

It is owned by the County Highway Agency.