US Bridges

Olive Trail over Blackbird CR

Poor

Putnam County, Missouri · S 32 T 65 N R 17 W · Structure no. 20415

Built
1996
29 years old
Condition
Poor
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
108 ft
1 main span
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

Olive Trail over Blackbird CR is a steel stringer/multi-beam or girder carrying Olive Trail over Blackbird CR in Putnam County, Missouri. It was built in 1996, so it is 29 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 40 vehicles a day, roughly 10% of them trucks, projected to reach 44 by 2044. The structure is 108 ft (32.9 m) long and 18 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesOlive Trail
CrossesBlackbird CR
LocationS 32 T 65 N R 17 W
RouteCounty Highway 259
CountyPutnam County
StateMissouri
Coordinates40.3968, -92.81988
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98.2 US tons
Inventory rating59.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadOther
Structure length108 ft (32.9 m)
Longest span58 ft (17.7 m)
Deck width18 ft (5.6 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic44 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$521,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Olive Trail over Blackbird CR built?

It was built in 1996, making it 29 years old in 2025.

What condition is Olive Trail over Blackbird CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2023.

How much traffic does Olive Trail over Blackbird CR carry?

About 40 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Olive Trail over Blackbird CR?

The structure is 108 ft (32.9 m) long with a longest span of 58 ft (17.7 m) and a deck 18 ft wide.

Who owns Olive Trail over Blackbird CR?

It is owned by the County Highway Agency.