US Bridges

County RD NW 600 over Reid CR

Poor

St. Clair County, Missouri · S 28 T 39 N R 27 W · Structure no. 17893

Built
1930
95 years old
Condition
Poor
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
20
2023 count
Owner
County
County Highway Agency

About this bridge

County RD NW 600 over Reid CR is a steel stringer/multi-beam or girder carrying County RD NW 600 over Reid CR in St. Clair County, Missouri. It was built in 1930, so it is 95 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.

It carries about 20 vehicles a day, roughly 10% of them trucks, projected to reach 24 by 2043. The structure is 35 ft (10.7 m) long and 14 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty RD NW 600
CrossesReid CR
LocationS 28 T 39 N R 27 W
RouteCounty Highway 166
CountySt. Clair County
StateMissouri
Coordinates38.11358, -93.90049
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.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating18.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic24 by 2043
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 statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$211,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD NW 600 over Reid CR built?

It was built in 1930, making it 95 years old in 2025.

What condition is County RD NW 600 over Reid 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 December 2023.

How much traffic does County RD NW 600 over Reid CR carry?

About 20 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD NW 600 over Reid CR?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 14 ft wide.

Who owns County RD NW 600 over Reid CR?

It is owned by the County Highway Agency.