Mariposa County, CA
109 public highway bridges
Mariposa County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Mariposa County, California contains 109 public highway bridges. Roughly 21.1% are rated “Good,” 67.9% “Fair,” and 11% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Condition Distribution
All Bridges (109)
TRIANGLE ROAD
PoorOver: SNOW CREEK
0.1 MI W DARRAH RD, Mariposa, CA
OLD TOLL ROAD
PoorOver: BEAR CREEK
3.0 MI W OF SR 49, Mariposa, CA
MARY HARRISON MINE
PoorOver: MAXWELL CREEK
AT SH 132, Mariposa, CA
STATE ROUTE 140
PoorOver: MILES CREEK
10-MPA-140-3.64, Mariposa, CA
6TH STREET
PoorOver: MARIPOSA CREEK
AT STROMING ROAD, Mariposa, CA
BUCKEYE ROAD
PoorOver: MARIPOSA CREEK
2.3 MI S/O OLD HWY, Mariposa, CA
STATE ROUTE 140
PoorOver: SWEETWATER CREEK
10-MPA-140-37.83, Mariposa, CA
STATE ROUTE 140
PoorOver: SLATE GULCH
10-MPA-140-37.09, Mariposa, CA
USONA ROAD
PoorOver: MIDDLE FK CHOWCHILLA RIV
2.2 MI SOUTH OF SR 49, Mariposa, CA
Read our methodology - how this data is sourced, computed, and verified.
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Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.