Terrestrial Wildlife Connectivity Barriers - Northern Region (1)

Regional Summary

CDFW staff identified a total of 41 wildlife barrier segments in Region 1, nine of which were added to the list in 2024: W168, W169, W170, W171, W172, W173, W174, W176 and priority barrier W175. Two top priority barrier segments (W001 and W002) and one priority segment (W003) were also identified by Region 2 staff. Top priority and priority barriers ranged in length from 1.9 to 100.2 kilometers (km) (mean = 32.1 km) and collectively represented 385.3 km of the State Highway System.

All top priority and priority barriers in Region 1 were associated with ungulate and/or carnivore species, and five segments coincided with SO 3362 priority areas (W001, W002, W004, W007, W150; 45% of total). Mesocarnivores were the most common target species among priority barriers in Region 1, associated with 12 priority segments. Deer were associated with 11 priority segments, mountain lions with seven, pronghorn with four, and elk, gray wolves, and black bears with three each. Amphibians were associated with two segments, while other species were noted in one segment. Segment W008 (US-97 Grass Lake) has a working group and wildlife crossing structure under construction. W009 (SR-139 Perez to Jump Scales) is noted in a Caltrans Transportation Concept Report for SR-139.

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