US Bridges

300th RD over N Blackbird CR

Good

Putnam County, Missouri · S 23 T 66 N R 19 W · Structure no. 29382

Built
2001
24 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
1 main span
Daily traffic
20
2024 count
Owner
County
County Highway Agency

About this bridge

300th RD over N Blackbird CR is a steel stringer/multi-beam or girder carrying 300th RD over N Blackbird CR in Putnam County, Missouri. It was built in 2001, so it is 24 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20 vehicles a day, roughly 10% of them trucks, projected to reach 22 by 2044. The structure is 50 ft (15.3 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
Carries300th RD
CrossesN Blackbird CR
LocationS 23 T 66 N R 19 W
RouteCounty Highway 127
CountyPutnam County
StateMissouri
Coordinates40.50111, -92.99506
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length50 ft (15.3 m)
Longest span50 ft (15.3 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2024)
Projected traffic22 by 2044
Trucks10%
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

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 300th RD over N Blackbird CR built?

It was built in 2001, making it 24 years old in 2025.

What condition is 300th RD over N Blackbird CR 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 February 2023.

How much traffic does 300th RD over N Blackbird CR carry?

About 20 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 300th RD over N Blackbird CR?

The structure is 50 ft (15.3 m) long with a longest span of 50 ft (15.3 m) and a deck 18 ft wide.

Who owns 300th RD over N Blackbird CR?

It is owned by the County Highway Agency.