US Bridges

Tiff RD over Mill CR

Fair

Washington County, Missouri · S 13 T 38 N R 3 E · Structure no. 13566

Built
1950
75 years old
Condition
Fair
inspected April 2024
Type
Other
Steel Continuous
Length
50 ft
5 main spans
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

Tiff RD over Mill CR is a steel continuous other carrying Tiff RD over Mill CR in Washington County, Missouri. It was built in 1950, so it is 75 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 42 by 2044. The structure is 50 ft (15.2 m) long and 12 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesTiff RD
CrossesMill CR
LocationS 13 T 38 N R 3 E
RouteCounty Highway 42
CountyWashington County
StateMissouri
Coordinates38.0179, -90.6527
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating33.7 US tons
Inventory rating14.9 US tons

Structure

Structure typeOther
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 10
Structure length50 ft (15.2 m)
Longest span10 ft (3 m)
Deck width12 ft (3.7 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deck15 ft (4.4 m)

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 closed8.1 mi (13 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 Tiff RD over Mill CR built?

It was built in 1950, making it 75 years old in 2025.

What condition is Tiff 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 Tiff RD over Mill CR carry?

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

How long is Tiff RD over Mill CR?

The structure is 50 ft (15.2 m) long with a longest span of 10 ft (3 m) and a deck 12 ft wide.

Who owns Tiff RD over Mill CR?

It is owned by the County Highway Agency.