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I-25 Sbl over Alamosa River

Sierra County, New Mexico · rated Good in the 2025 National Bridge Inventory

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

I-25 Sbl over Alamosa River in Sierra County, New Mexico, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1967 and reconstructed in 2015, making it 58 years old at the 2025 inventory.
It carries about 6,727 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 34 of the 112 inventoried bridges in Sierra County rated good (30.4%); 5 (4.5%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous prestressed concrete stringer or multi-beam girder
Length	about 363 ft
Location	6.59 M N Jct NM-181/I-25
NBI structure number	000000000009641
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-25 Nbl over Palomas Creek	1968	8,962	Fair
I-25 Sbl over Palomas Creek	1968	8,962	Fair
I-25 Nbl/sbl over Canada Honda	1968	8,962	Fair
I-25 Nbl/sbl over County Rd-b079	1968	8,962	Fair
I-25 NB over Nm-181	1967	8,510	Fair
I-25 Nbl over Percha Creek	1965	8,008	Fair