US Bridges

RM 620 S T/A over IH 35

Good

Williamson County, Texas · 0.02 MI S of RM 620 · Structure no. 142460001509522

Built
2009
16 years old
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
196 ft
2 main spans
Daily traffic
38,000
2015 count
Owner
State
State Highway Agency

About this bridge

RM 620 S T/A over IH 35 is a prestressed concrete box beam or girders - multiple carrying RM 620 S T/A over IH 35 in Williamson County, Texas. It was built in 2009, so it is 16 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 38,000 vehicles a day, projected to reach 42,310 by 2035. The structure is 196 ft (59.7 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesRM 620 S T/A
CrossesIH 35
Location0.02 MI S of RM 620
RouteInterstate 35
CountyWilliamson County
StateTexas
Coordinates30.50942, -97.68569
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length196 ft (59.7 m)
Longest span98 ft (29.9 m)
Deck width35 ft (10.7 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,000 (2015)
Projected traffic42,310 by 2035
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was RM 620 S T/A over IH 35 built?

It was built in 2009, making it 16 years old in 2025.

What condition is RM 620 S T/A over IH 35 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2023.

How much traffic does RM 620 S T/A over IH 35 carry?

About 38,000 vehicles per day (2015 count).

How long is RM 620 S T/A over IH 35?

The structure is 196 ft (59.7 m) long with a longest span of 98 ft (29.9 m) and a deck 35 ft wide.

Who owns RM 620 S T/A over IH 35?

It is owned by the State Highway Agency.