Structure 142460001509402 · Williamson County, TX

RM 620 over IH 35

Carries RM 620 over IH 35, 0.5 Mi S Of US 79.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT265 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9Substructure 5/9 · sets the rating

265 ft end to end, longest span 98 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a box-beam bridge.

Built198640 years old
Length265.1 ft80.8 m
Daily traffic41,111counted 2019
Last inspectedFebruary 2023every 24 months

Location

StateTexas
CountyWilliamson
Location0.5 Mi S Of US 79
CarriesRM 620
CrossesIH 35
Coordinates30.50976, -97.68608

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length265.1 ft (80.8 m)
Max Span98.1 ft (29.9 m)
Deck Width90.2 ft (27.5 m)
Deck Area2,222 sq m
Main Spans2
Year Built1986

Traffic

Avg Daily Traffic41,111 (2019)
Truck Traffic3%
Lanes On Bridge6
Lanes Under Bridge8

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number142460001509402

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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