US Bridges

County RD 450 over ST Johns Dtch

Fair

Scott County, Missouri · S 30 T 27 N R 14 E · Structure no. 16797

Built
1998
27 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
62 ft
1 main span
Daily traffic
80
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 450 over ST Johns Dtch is a steel stringer/multi-beam or girder carrying County RD 450 over ST Johns Dtch in Scott County, Missouri. It was built in 1998, so it is 27 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 80 vehicles a day, roughly 10% of them trucks, projected to reach 112 by 2043. The structure is 62 ft (18.9 m) long and 22 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty RD 450
CrossesST Johns Dtch
LocationS 30 T 27 N R 14 E
RouteCounty Highway 452
CountyScott County
StateMissouri
Coordinates36.95011, -89.57637
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length62 ft (18.9 m)
Longest span56 ft (17.1 m)
Deck width22 ft (6.8 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2023)
Projected traffic112 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 County RD 450 over ST Johns Dtch built?

It was built in 1998, making it 27 years old in 2025.

What condition is County RD 450 over ST Johns Dtch 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 January 2025.

How much traffic does County RD 450 over ST Johns Dtch carry?

About 80 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 450 over ST Johns Dtch?

The structure is 62 ft (18.9 m) long with a longest span of 56 ft (17.1 m) and a deck 22 ft wide.

Who owns County RD 450 over ST Johns Dtch?

It is owned by the County Highway Agency.