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SH 348 Ml over Ironstone Canal

Montrose County, Colorado · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

SH 348 Ml over Ironstone Canal in Montrose County, Colorado, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1963 and reconstructed in 1977, making it 62 years old at the 2025 inventory.
It carries about 590 vehicles a day (traffic count year 2020).
Its listed owner is the state highway agency.
It is one of 3 of the 117 inventoried bridges in Montrose County rated poor (2.6%); 3 (2.6%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 29 ft
Location	4.5 MI W of Olathe
NBI structure number	J-04-X
Condition class	Poor

Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.

Bridge	Built	Vehicles/day	Condition
US 550 Ml over Cedar Wash	1936	25,000	Fair
US 50 Ml over Cedar Creek	1958	14,000	Fair
US 50 Ml over Loutzenheizer Wash	1989	13,000	Fair
US 550 Ml over Horsefly Creek	1994	13,000	Good
SH 90 Ml over Uncompahgre River	1969	12,000	Fair
US 550 Ml over Montrose+delta Canal	1992	11,000	Good