US Bridges

County RD NW 650 over Monegaw CR

Good

St. Clair County, Missouri · S 28 T 39 N R 28 W · Structure no. 17653

Built
2000
25 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
15
2023 count
Owner
County
County Highway Agency

About this bridge

County RD NW 650 over Monegaw CR is a steel stringer/multi-beam or girder carrying County RD NW 650 over Monegaw CR in St. Clair County, Missouri. It was built in 2000, so it is 25 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15 vehicles a day, roughly 10% of them trucks, projected to reach 18 by 2043. The structure is 35 ft (10.7 m) long and 20 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty RD NW 650
CrossesMonegaw CR
LocationS 28 T 39 N R 28 W
RouteCounty Highway 159
CountySt. Clair County
StateMissouri
Coordinates38.1238, -94.00563
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating94.2 US tons
Inventory rating56.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length35 ft (10.7 m)
Longest span32 ft (9.8 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2023)
Projected traffic18 by 2043
Trucks10%
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 County RD NW 650 over Monegaw CR built?

It was built in 2000, making it 25 years old in 2025.

What condition is County RD NW 650 over Monegaw CR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does County RD NW 650 over Monegaw CR carry?

About 15 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD NW 650 over Monegaw CR?

The structure is 35 ft (10.7 m) long with a longest span of 32 ft (9.8 m) and a deck 20 ft wide.

Who owns County RD NW 650 over Monegaw CR?

It is owned by the County Highway Agency.