US Bridges

FM 584 Knickerbckr over Loop 306

Fair

Tom Green County, Texas · At Loop 306 · Structure no. 072260007708052

Built
1962
63 years old, rebuilt 1980
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
210 ft
2 main spans
Daily traffic
21,453
2022 count
Owner
State
State Highway Agency

About this bridge

FM 584 Knickerbckr over Loop 306 is a steel continuous stringer/multi-beam or girder carrying FM 584 Knickerbckr over Loop 306 in Tom Green County, Texas. It was built in 1962 and reconstructed in 1980, so it is 63 years old, older than the Texas average of 44.4 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 21,453 vehicles a day, roughly 5% of them trucks, projected to reach 30,034 by 2042. The structure is 210 ft (64 m) long and 76 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesFM 584 Knickerbckr
CrossesLoop 306
LocationAt Loop 306
RouteState Highway 584
CountyTom Green County
StateTexas
Coordinates31.41623, -100.47365
Functional classUrban Other Principal Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadOther
Structure length210 ft (64 m)
Longest span65 ft (19.8 m)
Deck width76 ft (23.2 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,453 (2022)
Projected traffic30,034 by 2042
Trucks5%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$34,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was FM 584 Knickerbckr over Loop 306 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1980.

What condition is FM 584 Knickerbckr over Loop 306 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 June 2024.

How much traffic does FM 584 Knickerbckr over Loop 306 carry?

About 21,453 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is FM 584 Knickerbckr over Loop 306?

The structure is 210 ft (64 m) long with a longest span of 65 ft (19.8 m) and a deck 76 ft wide.

Who owns FM 584 Knickerbckr over Loop 306?

It is owned by the State Highway Agency.