US Bridges

Upper Blackwell RD over Big Rvr

Fair

Jefferson County, Missouri · S 6 T 38 N R 4 E · Structure no. 29490

Built
2003
22 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
473 ft
6 main spans
Daily traffic
268
2023 count
Owner
County
County Highway Agency

About this bridge

Upper Blackwell RD over Big Rvr is a prestressed concrete continuous stringer/multi-beam or girder carrying Upper Blackwell RD over Big Rvr in Jefferson County, Missouri. It was built in 2003, so it is 22 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 268 vehicles a day, roughly 10% of them trucks, projected to reach 536 by 2043. The structure is 473 ft (144.2 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUpper Blackwell RD
CrossesBig Rvr
LocationS 6 T 38 N R 4 E
RouteCounty Highway 0
CountyJefferson County
StateMissouri
Coordinates38.04453, -90.62078
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating61.5 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length473 ft (144.2 m)
Longest span100 ft (30.5 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic268 (2023)
Projected traffic536 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Upper Blackwell RD over Big Rvr built?

It was built in 2003, making it 22 years old in 2025.

What condition is Upper Blackwell RD over Big Rvr 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 2025.

How much traffic does Upper Blackwell RD over Big Rvr carry?

About 268 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Upper Blackwell RD over Big Rvr?

The structure is 473 ft (144.2 m) long with a longest span of 100 ft (30.5 m) and a deck 32 ft wide.

Who owns Upper Blackwell RD over Big Rvr?

It is owned by the County Highway Agency.