Structure 91610001501261 · McLennan County, TX

IH 35 SB over 18th ST

Carries IH 35 SB over 18th ST, 3.1 Mi NE Of SH 6.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT212 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 6/9

212 ft end to end, longest span 77 ft: about 3 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 tee-beam bridge.

Built1965rebuilt 1991
Length211.9 ft64.6 m
Daily traffic72,009counted 2017
Last inspectedMarch 2023every 48 months

Location

StateTexas
CountyMcLennan
Location3.1 Mi NE Of SH 6
CarriesIH 35 SB
Crosses18th ST
Coordinates31.53486, -97.13000

Physical Characteristics

MaterialConcrete Continuous
DesignTee Beam
Total Length211.9 ft (64.6 m)
Max Span77.1 ft (23.5 m)
Deck Width58.7 ft (17.9 m)
Deck Area1156.3 sq m
Main Spans4
Year Built1965 (reconstructed 1991)

Traffic

Avg Daily Traffic72,009 (2017)
Truck Traffic21%
Lanes On Bridge3
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure Number091610001501261

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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