US Bridges

County RD NW 100 over Wells Br

Fair

St. Clair County, Missouri · S 20 T 38 N R 28 W · Structure no. 18534

Built
1917
108 years old, rebuilt 2001
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
2 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

County RD NW 100 over Wells Br is a steel stringer/multi-beam or girder carrying County RD NW 100 over Wells Br in St. Clair County, Missouri. It was built in 1917 and reconstructed in 2001, so it is 108 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.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 36 by 2043. The structure is 35 ft (10.7 m) long and 21 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesCounty RD NW 100
CrossesWells Br
LocationS 20 T 38 N R 28 W
RouteCounty Highway 188
CountySt. Clair County
StateMissouri
Coordinates38.04522, -94.03005
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 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 alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length35 ft (10.7 m)
Longest span16 ft (4.9 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic36 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD NW 100 over Wells Br built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 2001.

What condition is County RD NW 100 over Wells Br 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 December 2023.

How much traffic does County RD NW 100 over Wells Br carry?

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

How long is County RD NW 100 over Wells Br?

The structure is 35 ft (10.7 m) long with a longest span of 16 ft (4.9 m) and a deck 21 ft wide.

Who owns County RD NW 100 over Wells Br?

It is owned by the County Highway Agency.