Ravendale

Lassen County (population ~28,000) is a northeastern California county on the eastern slope of the southern Cascades and the western edge of the Great Basin, bounded by Modoc County to the north, Washoe County (Nevada) to the east, Sierra and Plumas Counties to the south, and Shasta and Tehama Counties to the west. The county seat and only incorporated city is Susanville. Major unincorporated communities include Bieber, Doyle, Herlong, Janesville, Litchfield, Milford, Nubieber, Ravendale, Standish, Termo, Wendel, and Westwood. The county Board of Supervisors administers ADU permitting on unincorporated parcels under California Government Code Sec. 65852.2 and 65852.22 (state ADU preemption regime). Lassen's economy historically rested on three institutional pillars: Lassen Volcanic National Park-adjacent recreation, Sierra Pacific Industries timber operations, and the corrections industry - California Correctional Center (CCC, north of Susanville, deactivated 2023) and High Desert State Prison (Susanville, ~5,000 inmates). The 2023 closure of CCC eliminated ~1,000 state jobs and is the dominant economic story in the county. Eagle Lake (the second-largest natural lake entirely in California after Clear Lake) anchors the recreational economy. Federal lands dominate: Lassen National Forest, Modoc National Forest (small portion), BLM Eagle Lake Field Office lands, Plumas National Forest (south county), and Lassen Volcanic National Park (small portion).

• Lassen County Code Title 18 - Land Use and Development Code, ADU/JADU provisions
• Cal. Gov't Code Sec. 65852.2 (Accessory Dwelling Units)
• Cal. Gov't Code Sec. 65852.22 (Junior Accessory Dwelling Units)
• California Correctional Center (CCC) Susanville closure - 2023; AB 89 / state budget actions
• Federal land managers: Lassen NF, BLM Eagle Lake FO, NPS Lassen Volcanic NP

State-floor overlay: California state ADU preemption applies in full to unincorporated parcels. AB 1033 condo-conversion election status pending verification. AB 976 prohibits owner-occupancy mandates on detached ADUs. SB 9 urban lot-split provisions apply only within incorporated cities (Susanville), not in unincorporated Lassen. HCD oversight: ordinance amendments submitted within 60 days per Sec. 65852.2(h).

Lassen County overlays of consequence: CAL FIRE State Responsibility Area on most non-federal land with Very High FHSZ across the western and southern county after the 2021 Dixie Fire (the largest single fire in California history at the time, ~963,000 acres) and 2020-2021 fire sequence; Lassen Volcanic National Park (small portion in southwest Lassen); Lassen National Forest, Plumas National Forest (south), Modoc National Forest (north); BLM Eagle Lake Field Office lands; Sierra Army Depot at Herlong (active federal explosive-storage installation); High Desert State Prison and the deactivated California Correctional Center (state institutional - CCC closure 2023 was the dominant economic event); Susanville Indian Rancheria tribal jurisdiction; Eagle Lake basin (the second-largest natural lake entirely in California, ~27,000 surface acres, stocked Eagle Lake trout endemic); Honey Lake Valley (a Pleistocene-relict alkali sink, periodically dry); FEMA SFHA along the Susan River, Pit River (north), Honey Lake basin; alquist-priolo zones along the Honey Lake Fault Zone and the eastern Sierra frontal fault.

• CAL FIRE State Responsibility Area / post-Dixie Very High FHSZ
• Dixie Fire / Sheep Fire / Beckwourth Complex post-fire rebuild streamlining
• Lassen Volcanic National Park / Lassen NF / Plumas NF / Modoc NF / BLM Eagle Lake FO
• Sierra Army Depot Quantity-Distance Arcs (Herlong)
• High Desert State Prison / California Correctional Center (deactivated 2023)
• Susanville Indian Rancheria
• FEMA SFHA - Susan River / Pit River / Honey Lake basin
• Honey Lake Fault Zone / Eastern Sierra Frontal Faults

Lassen County Planning and Building Services Department issues ADU permits for unincorporated parcels including Janesville, Doyle, Milford, Herlong, Standish, Litchfield, Bieber, Nubieber, Westwood, and the broader Honey Lake Valley and Eagle Lake basin. Practical permitting frictions: CAL FIRE State Responsibility Area covers most forest and rangeland with Moderate to Very High FHSZ - the 2021 Dixie Fire (largest single fire in California history at the time, ~963,000 acres across Plumas/Lassen/Tehama/Butte/Shasta counties) burned across western and southern Lassen, and the 2020 Sheep Fire and 2021 Beckwourth Complex / Sugar Fire affected southern Lassen; CAL FIRE Direct Protection Area dominates the southern and western county; very low housing densities and long emergency-response times from CAL FIRE / volunteer fire departments drive elevated defensible-space scrutiny; FEMA SFHA along the Susan River, Pit River (extreme north), Eagle Lake outlet (intermittent), Honey Lake / Honey Lake basin (the lake fluctuates dramatically); high winter snow loads (4,000+ ft elevation) drive structural-loading review; Sierra Army Depot at Herlong (federal) carries explosive-safety quantity-distance arcs that affect surrounding land use; the Susanville Indian Rancheria holds tribal-trust land near Susanville.