US Bridges

Grate Ave over Mason CR

PoorPosted for load

Daviess County, Missouri · S 35 T 61 N R 27 W · Structure no. 23493

Built
1975
50 years old, rebuilt 1984
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
4 main spans
Daily traffic
25
2024 count
Owner
County
County Highway Agency

About this bridge

Grate Ave over Mason CR is a steel stringer/multi-beam or girder carrying Grate Ave over Mason CR in Daviess County, Missouri. It was built in 1975 and reconstructed in 1984, so it is 50 years old, older 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 25 vehicles a day, roughly 10% of them trucks, projected to reach 29 by 2044. The structure is 65 ft (19.8 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesGrate Ave
CrossesMason CR
LocationS 35 T 61 N R 27 W
RouteCounty Highway 410
CountyDaviess County
StateMissouri
Coordinates40.03956, -93.89782
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating20.8 US tons
Inventory rating9.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans4
Design loadOther
Structure length65 ft (19.8 m)
Longest span21 ft (6.4 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic29 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$494,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grate Ave over Mason CR built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1984.

What condition is Grate Ave over Mason 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 Grate Ave over Mason CR carry?

About 25 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Grate Ave over Mason CR?

The structure is 65 ft (19.8 m) long with a longest span of 21 ft (6.4 m) and a deck 16 ft wide.

Who owns Grate Ave over Mason CR?

It is owned by the County Highway Agency.