Structure 241230041503009 · Jeff Davis County, TX

SH 166 over Merrill Canyon

Carries SH 166 over Merrill Canyon, 0.05 Mi N Of RM 505.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT110 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

110 ft end to end, longest span 30 ft. Lengths and the car 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 slab bridge.

Built195967 years old
Length109.9 ft33.5 m
Daily traffic100counted 2020
Last inspectedMarch 2023every 24 months

Location

StateTexas
CountyJeff Davis
Location0.05 Mi N Of RM 505
CarriesSH 166
CrossesMerrill Canyon
Coordinates30.54843, -104.26981

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length109.9 ft (33.5 m)
Max Span29.9 ft (9.1 m)
Deck Width31.8 ft (9.7 m)
Deck Area324.9 sq m
Main Spans4
Year Built1959

Traffic

Avg Daily Traffic100 (2020)
Truck Traffic7%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number241230041503009

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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