US Bridges

School House RD over Modoc Br

Fair

Montgomery County, Missouri · S 30 T 46 N R 5 W · Structure no. 21258

Built
1960
65 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
25
2023 count
Owner
County
County Highway Agency

About this bridge

School House RD over Modoc Br is a steel stringer/multi-beam or girder carrying School House RD over Modoc Br in Montgomery County, Missouri. It was built in 1960, so it is 65 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 25 vehicles a day, roughly 10% of them trucks, projected to reach 31 by 2043. The structure is 36 ft (11 m) long and 17 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSchool House RD
CrossesModoc Br
LocationS 30 T 46 N R 5 W
RouteCounty Highway 297
CountyMontgomery County
StateMissouri
Coordinates38.71625, -91.51853
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length36 ft (11 m)
Longest span33 ft (10.1 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2023)
Projected traffic31 by 2043
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$223,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was School House RD over Modoc Br built?

It was built in 1960, making it 65 years old in 2025.

What condition is School House RD over Modoc 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 January 2023.

How much traffic does School House RD over Modoc Br carry?

About 25 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is School House RD over Modoc Br?

The structure is 36 ft (11 m) long with a longest span of 33 ft (10.1 m) and a deck 17 ft wide.

Who owns School House RD over Modoc Br?

It is owned by the County Highway Agency.