US Bridges

Johnson Hollow RD over Mill CR

FairPosted for load

Washington County, Missouri · S 13 T 38 N R 3 E · Structure no. 13465

Built
1994
31 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
42 ft
4 main spans
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

Johnson Hollow RD over Mill CR is a concrete slab carrying Johnson Hollow RD over Mill CR in Washington County, Missouri. It was built in 1994, so it is 31 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 35 vehicles a day, roughly 10% of them trucks, projected to reach 42 by 2044. The structure is 42 ft (12.8 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesJohnson Hollow RD
CrossesMill CR
LocationS 13 T 38 N R 3 E
RouteCounty Highway 39
CountyWashington County
StateMissouri
Coordinates38.0187, -90.6569
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating16.9 US tons
Inventory rating9.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 10
Structure length42 ft (12.8 m)
Longest span10 ft (3 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic42 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$366,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Johnson Hollow RD over Mill CR built?

It was built in 1994, making it 31 years old in 2025.

What condition is Johnson Hollow RD over Mill CR 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 April 2024.

How much traffic does Johnson Hollow RD over Mill CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Johnson Hollow RD over Mill CR?

The structure is 42 ft (12.8 m) long with a longest span of 10 ft (3 m) and a deck 16 ft wide.

Who owns Johnson Hollow RD over Mill CR?

It is owned by the County Highway Agency.