US Bridges

Dietrich RD over Trib of Mccoy CR

PoorPosted for load

St. Charles County, Missouri · S 18 T 47 N R 1 E · Structure no. 24254

Built
1987
38 years old
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
2,429
2024 count
Owner
County
County Highway Agency

About this bridge

Dietrich RD over Trib of Mccoy CR is a steel stringer/multi-beam or girder carrying Dietrich RD over Trib of Mccoy CR in St. Charles County, Missouri. It was built in 1987, so it is 38 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. Its operating status is: posted for load restriction.

It carries about 2,429 vehicles a day, roughly 10% of them trucks, projected to reach 5,344 by 2044. The structure is 25 ft (7.6 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesDietrich RD
CrossesTrib of Mccoy CR
LocationS 18 T 47 N R 1 E
RouteCounty Highway 5
CountySt. Charles County
StateMissouri
Coordinates38.83934, -90.95122
Functional classRural Minor Collector

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
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 alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length25 ft (7.6 m)
Longest span22 ft (6.7 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,429 (2024)
Projected traffic5,344 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$300,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Dietrich RD over Trib of Mccoy CR built?

It was built in 1987, making it 38 years old in 2025.

What condition is Dietrich RD over Trib of Mccoy 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 2024.

How much traffic does Dietrich RD over Trib of Mccoy CR carry?

About 2,429 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Dietrich RD over Trib of Mccoy CR?

The structure is 25 ft (7.6 m) long with a longest span of 22 ft (6.7 m) and a deck 29 ft wide.

Who owns Dietrich RD over Trib of Mccoy CR?

It is owned by the County Highway Agency.