Structure 141570007104068 · Mason County, TX

US 87 NB over Llano River

Carries US 87 NB over Llano River, 1.30 Mi NW Of RM 783.

Overall conditionFair

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

How ratings work
Deck8/9 · Very Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT915 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9Substructure 6/9 · sets the rating

915 ft end to end, longest span 90 ft: about 2.5 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.

Built197254 years old
Length915.0 ft278.9 m
Daily traffic1,490counted 2020
Last inspectedJune 2023every 24 months

Location

StateTexas
CountyMason
Location1.30 Mi NW Of RM 783
CarriesUS 87 NB
CrossesLlano River
Coordinates30.66132, -99.10977

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length915.0 ft (278.9 m)
Max Span89.9 ft (27.4 m)
Deck Width44.3 ft (13.5 m)
Deck Area3765.2 sq m
Main Spans11
Year Built1972

Traffic

Avg Daily Traffic1,490 (2020)
Truck Traffic18%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical8 — Stable, low risk
Structure Number141570007104068

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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