Structure 130080018702420 · Austin County, TX

SH 36 SB over Mill Creek Relief

Carries SH 36 SB over Mill Creek Relief, 3.9 Mi NW Of FM 331.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT810 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

810 ft end to end, longest span 135 ft: about 2.3 football fields. 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 multi-beam bridge.

Built201313 years old
Length810.0 ft246.9 m
Daily traffic3,818counted 2020
Last inspectedFebruary 2023every 24 months

Location

StateTexas
CountyAustin
Location3.9 Mi NW Of FM 331
CarriesSH 36 SB
CrossesMill Creek Relief
Coordinates29.88581, -96.20998

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length810.0 ft (246.9 m)
Max Span134.8 ft (41.1 m)
Deck Width40.0 ft (12.2 m)
Deck Area3012.2 sq m
Main Spans6
Year Built2013

Traffic

Avg Daily Traffic3,818 (2020)
Truck Traffic21%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number130080018702420

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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