US Bridges

Portage RD over Flood Chnl

Fair

St. Charles County, Missouri · S 35 T 48 N R 6 E · Structure no. 16956

Built
1994
31 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
24 ft
3 main spans
Daily traffic
192
2024 count
Owner
County
County Highway Agency

About this bridge

Portage RD over Flood Chnl is a concrete culvert carrying Portage RD over Flood Chnl in St. Charles County, Missouri. It was built in 1994, so it is 31 years old, younger 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 6 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 192 vehicles a day, roughly 5% of them trucks, projected to reach 422 by 2044. The structure is 24 ft (7.3 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesPortage RD
CrossesFlood Chnl
LocationS 35 T 48 N R 6 E
RouteCounty Highway 138
CountySt. Charles County
StateMissouri
Coordinates38.92964, -90.36695
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadOther
Structure length24 ft (7.3 m)
Longest span7 ft (2.1 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic192 (2024)
Projected traffic422 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Portage RD over Flood Chnl built?

It was built in 1994, making it 31 years old in 2025.

What condition is Portage RD over Flood Chnl 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 February 2024.

How much traffic does Portage RD over Flood Chnl carry?

About 192 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Portage RD over Flood Chnl?

The structure is 24 ft (7.3 m) long with a longest span of 7 ft (2.1 m) and a deck 30 ft wide.

Who owns Portage RD over Flood Chnl?

It is owned by the County Highway Agency.