US Bridges

Upper Blackwell RD over Trib of Big Rvr

Fair

Jefferson County, Missouri · S 4 T 38 N R 4 E · Structure no. 22827

Built
1900
125 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
35 ft
2 main spans
Daily traffic
300
2023 count
Owner
County
County Highway Agency

About this bridge

Upper Blackwell RD over Trib of Big Rvr is a concrete continuous culvert carrying Upper Blackwell RD over Trib of Big Rvr in Jefferson County, Missouri. It was built in 1900, so it is 125 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 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 300 vehicles a day, roughly 20% of them trucks, projected to reach 600 by 2043. The structure is 35 ft (10.7 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUpper Blackwell RD
CrossesTrib of Big Rvr
LocationS 4 T 38 N R 4 E
RouteCounty Highway 373
CountyJefferson County
StateMissouri
Coordinates38.03738, -90.59887
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 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 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length35 ft (10.7 m)
Longest span16 ft (4.9 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic600 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Upper Blackwell RD over Trib of Big Rvr built?

It was built in 1900, making it 125 years old in 2025.

What condition is Upper Blackwell RD over Trib of 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 Trib of Big Rvr carry?

About 300 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Upper Blackwell RD over Trib of Big Rvr?

The structure is 35 ft (10.7 m) long with a longest span of 16 ft (4.9 m) and a deck 26 ft wide.

Who owns Upper Blackwell RD over Trib of Big Rvr?

It is owned by the County Highway Agency.