Structure 111740011806083 · Nacogdoches County, TX

SH 21 over Angelina River Relief

Carries SH 21 over Angelina River Relief, 16.4 Mi W Of US 59.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT492 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

492 ft end to end, longest span 72 ft: about 7 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 multi-beam bridge.

Built199828 years old
Length492.1 ft150 m
Daily traffic2,131counted 2020
Last inspectedMarch 2024every 24 months

Location

StateTexas
CountyNacogdoches
Location16.4 Mi W Of US 59
CarriesSH 21
CrossesAngelina River Relief
Coordinates31.67199, -94.94442

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length492.1 ft (150 m)
Max Span71.9 ft (21.9 m)
Deck Width45.3 ft (13.8 m)
Deck Area2,070 sq m
Main Spans7
Year Built1998

Traffic

Avg Daily Traffic2,131 (2020)
Truck Traffic15%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number111740011806083

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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