Structure 121700351007276 · Montgomery County, TX

SH 99 Wbml over White Oak Crk

Carries SH 99 Wbml over White Oak Crk, 0.61 Mi W Of IH 69.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructure8/9 · Very Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT681 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 7/9 · sets the ratingSubstructure 8/9

681 ft end to end, longest span 122 ft: about 1.9 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.

Built20224 years old
Length680.8 ft207.5 m
Daily traffic15,700counted 2019
Last inspectedDecember 2024every 24 months

Location

StateTexas
CountyMontgomery
Location0.61 Mi W Of IH 69
CarriesSH 99 Wbml
CrossesWhite Oak Crk
Coordinates30.12965, -95.23986

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length680.8 ft (207.5 m)
Max Span122.0 ft (37.2 m)
Deck Width40.0 ft (12.2 m)
Deck Area2531.5 sq m
Main Spans6
Year Built2022

Traffic

Avg Daily Traffic15,700 (2019)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number121700351007276

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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