US Bridges

Balkan RD over Unnamed CR

Good

Linn County, Missouri · S 8 T 58 N R 21 W · Structure no. 20378

Built
1989
36 years old, rebuilt 2010
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
30
2024 count
Owner
County
County Highway Agency

About this bridge

Balkan RD over Unnamed CR is a steel stringer/multi-beam or girder carrying Balkan RD over Unnamed CR in Linn County, Missouri. It was built in 1989 and reconstructed in 2010, so it is 36 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 30 vehicles a day, roughly 10% of them trucks, projected to reach 33 by 2044. The structure is 28 ft (8.5 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBalkan RD
CrossesUnnamed CR
LocationS 8 T 58 N R 21 W
RouteCounty Highway 257
CountyLinn County
StateMissouri
Coordinates39.85195, -93.26369
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating50.6 US tons
Inventory rating29.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2024)
Projected traffic33 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$185,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Balkan RD over Unnamed CR built?

It was built in 1989, making it 36 years old in 2025. It was reconstructed in 2010.

What condition is Balkan RD over Unnamed 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 December 2024.

How much traffic does Balkan RD over Unnamed CR carry?

About 30 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Balkan RD over Unnamed CR?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 16 ft wide.

Who owns Balkan RD over Unnamed CR?

It is owned by the County Highway Agency.