US Bridges

S Grand Ave over Flat CR

Poor

Pettis County, Missouri · S 21 T 45 N R 21 W · Structure no. 19867

Built
1920
105 years old
Condition
Poor
inspected February 2024
Type
Truss - Thru
Steel
Length
170 ft
2 main spans
Daily traffic
400
2024 count
Owner
County
County Highway Agency

About this bridge

S Grand Ave over Flat CR is a steel truss - thru carrying S Grand Ave over Flat CR in Pettis County, Missouri. It was built in 1920, so it is 105 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.

It carries about 400 vehicles a day, roughly 10% of them trucks, projected to reach 680 by 2044. The structure is 170 ft (51.8 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS Grand Ave
CrossesFlat CR
LocationS 21 T 45 N R 21 W
RouteCounty Highway 237
CountyPettis County
StateMissouri
Coordinates38.65614, -93.2407
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
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.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.5 US tons
Inventory rating42.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans2
Design loadOther
Structure length170 ft (51.8 m)
Longest span85 ft (25.9 m)
Deck width16 ft (4.8 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic400 (2024)
Projected traffic680 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S Grand Ave over Flat CR built?

It was built in 1920, making it 105 years old in 2025.

What condition is S Grand Ave over Flat 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 February 2024.

How much traffic does S Grand Ave over Flat CR carry?

About 400 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is S Grand Ave over Flat CR?

The structure is 170 ft (51.8 m) long with a longest span of 85 ft (25.9 m) and a deck 16 ft wide.

Who owns S Grand Ave over Flat CR?

It is owned by the County Highway Agency.