US Bridges

Sierra Parkway over Black Crk

Fair

Jefferson County, Missouri · S 2019 T 42 N R 6 E · Structure no. 37012

Built
1995
30 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

Sierra Parkway over Black Crk is a concrete culvert carrying Sierra Parkway over Black Crk in Jefferson County, Missouri. It was built in 1995, so it is 30 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 340 by 2043. The structure is 25 ft (7.6 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSierra Parkway
CrossesBlack Crk
LocationS 2019 T 42 N R 6 E
RouteCounty Highway 824
CountyJefferson County
StateMissouri
Coordinates38.40319, -90.38666
Functional classUrban 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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width41 ft (12.4 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic340 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sierra Parkway over Black Crk built?

It was built in 1995, making it 30 years old in 2025.

What condition is Sierra Parkway over Black Crk 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 Sierra Parkway over Black Crk carry?

About 200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Sierra Parkway over Black Crk?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 41 ft wide.

Who owns Sierra Parkway over Black Crk?

It is owned by the County Highway Agency.