US Bridges

306 S over Side Dtch

Good

Clark County, Missouri · S 1 T 64 N R 6 W · Structure no. 33794

Built
2011
14 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
16
2024 count
Owner
State
State Highway Agency

About this bridge

306 S over Side Dtch is a prestressed concrete box beam or girders - multiple carrying 306 S over Side Dtch in Clark County, Missouri. It was built in 2011, so it is 14 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 16 vehicles a day, roughly 25% of them trucks, projected to reach 23 by 2044. The structure is 30 ft (9.1 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
Carries306 S
CrossesSide Dtch
LocationS 1 T 64 N R 6 W
RouteCounty Highway 306
CountyClark County
StateMissouri
Coordinates40.36504, -91.51245
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.3 US tons
Inventory rating53.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2024)
Projected traffic23 by 2044
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 306 S over Side Dtch built?

It was built in 2011, making it 14 years old in 2025.

What condition is 306 S over Side Dtch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does 306 S over Side Dtch carry?

About 16 vehicles per day (2024 count), of which roughly 25% are trucks.

How long is 306 S over Side Dtch?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 27 ft wide.

Who owns 306 S over Side Dtch?

It is owned by the State Highway Agency.