US Bridges

Antelope RD over Mason Spring CR

Poor

Newton County, Missouri · S 27 T 25 N R 34 W · Structure no. 24692

Built
1995
30 years old
Condition
Poor
inspected January 2025
Type
Truss - Thru
Steel
Length
73 ft
1 main span
Daily traffic
80
2024 count
Owner
County
County Highway Agency

About this bridge

Antelope RD over Mason Spring CR is a steel truss - thru carrying Antelope RD over Mason Spring CR in Newton County, Missouri. It was built in 1995, so it is 30 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.

It carries about 80 vehicles a day, roughly 10% of them trucks, projected to reach 124 by 2044. The structure is 73 ft (22.3 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesAntelope RD
CrossesMason Spring CR
LocationS 27 T 25 N R 34 W
RouteCounty Highway 533
CountyNewton County
StateMissouri
Coordinates36.79453, -94.59412
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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19.8 US tons
Inventory rating13.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length73 ft (22.3 m)
Longest span70 ft (21.3 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2024)
Projected traffic124 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$544,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Antelope RD over Mason Spring CR built?

It was built in 1995, making it 30 years old in 2025.

What condition is Antelope RD over Mason Spring 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 January 2025.

How much traffic does Antelope RD over Mason Spring CR carry?

About 80 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Antelope RD over Mason Spring CR?

The structure is 73 ft (22.3 m) long with a longest span of 70 ft (21.3 m) and a deck 20 ft wide.

Who owns Antelope RD over Mason Spring CR?

It is owned by the County Highway Agency.