US Bridges

Watts ST over Flat Rvr

Good

St. Francois County, Missouri · S 3272 T 36 N R 5 E · Structure no. 17177

Built
1996
29 years old
Condition
Good
inspected December 2024
Type
Slab
Prestressed Concrete
Length
129 ft
4 main spans
Daily traffic
3,000
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Watts ST over Flat Rvr is a prestressed concrete slab carrying Watts ST over Flat Rvr in St. Francois County, Missouri. It was built in 1996, so it is 29 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 3,000 vehicles a day, roughly 10% of them trucks, projected to reach 4,500 by 2043. The structure is 129 ft (39.3 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesWatts ST
CrossesFlat Rvr
LocationS 3272 T 36 N R 5 E
RouteCity Street 145
CountySt. Francois County
StateMissouri
Coordinates37.85527, -90.51257
Functional classUrban Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span34 ft (10.4 m)
Deck width43 ft (13.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2023)
Projected traffic4,500 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Watts ST over Flat Rvr built?

It was built in 1996, making it 29 years old in 2025.

What condition is Watts ST over Flat Rvr 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 2024.

How much traffic does Watts ST over Flat Rvr carry?

About 3,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Watts ST over Flat Rvr?

The structure is 129 ft (39.3 m) long with a longest span of 34 ft (10.4 m) and a deck 43 ft wide.

Who owns Watts ST over Flat Rvr?

It is owned by the City or Municipal Highway Agency.