US Bridges

Indigo RD over Bear Br

FairPosted for load

Linn County, Missouri · S 20 T 59 N R 19 W · Structure no. 18397

Built
1930
95 years old, rebuilt 1982
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
5
2024 count
Owner
County
County Highway Agency

About this bridge

Indigo RD over Bear Br is a steel stringer/multi-beam or girder carrying Indigo RD over Bear Br in Linn County, Missouri. It was built in 1930 and reconstructed in 1982, so it is 95 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 5 vehicles a day, roughly 10% of them trucks, projected to reach 6 by 2044. The structure is 30 ft (9.1 m) long and 13 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIndigo RD
CrossesBear Br
LocationS 20 T 59 N R 19 W
RouteCounty Highway 184
CountyLinn County
StateMissouri
Coordinates39.92019, -93.04771
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating7.9 US tons
Inventory rating5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width13 ft (4.1 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2024)
Projected traffic6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$289,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Indigo RD over Bear Br built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1982.

What condition is Indigo RD over Bear Br 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 November 2024.

How much traffic does Indigo RD over Bear Br carry?

About 5 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Indigo RD over Bear Br?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 13 ft wide.

Who owns Indigo RD over Bear Br?

It is owned by the County Highway Agency.