Integrated roadside vegetation management plans
Our maintenance crews use integrated roadside vegetation management (IRVM) plans to apply the right tools, techniques and timing to care for the soil and greenery alongside highways. We update our training programs yearly with successes and lessons learned and we welcome public input.
Integrated roadside vegetation management plans
Each plan lists intended routine maintenance activities, weed control priorities, sensitive area locations and other relevant information. They also include a record-keeping system of mapping and tracking work through our Highway Activity Tracking System (HATS).
Eastern Region
- Area 1 - Most of Spokane, south Pend Oreille and southeast Stevens Counties (PDF 798KB)
- Area 2 - Whitman, southeast Adams and a small portion of south Spokane Counties (PDF 693KB)
- Area 3 - Adams (all but southeast) and Lincoln Counties (PDF 1MB)
- Area 4 - Ferry, Stevens (all but southeast) and north Pend Oreille Counties (PDF 497KB)
Northwest Region
- Area 1 - Whatcom and northwest Skagit Counties (PDF 2MB)
- Area 2 - Skagit (all but northwest) and north Snohomish Counties (PDF 2MB)
- Area 3 - South Snohomish and northeast King Counties (PDF 270KB)
- Area 4 - South King and east Pierce Counties (PDF 2MB)
- Area 5 - Seattle-Bellevue and central King County (PDF 2MB)
North Central Region
- Area 1 - Chelan, west Douglas, east King and north Kittitas Counties (PDF 789KB)
- Area 2 - Grant, west Adams and a small portion of north Franklin Counties (PDF 1MB)
- Area 3 - Okanogan, east Douglas and east Skagit Counties (PDF 1MB)
Olympic Region
- Area 1 - Pierce and Thurston Counties (PDF 1.19MB)
- Area 2 - Kitsap, Mason, and southeast Jefferson Counties (PDF 563KB)
- Area 3 - Clallam and Jefferson Counties (PDF 783KB)
- Area 4 - Grays Harbor County (PDF 546KB)
South Central Region
- Area 1 - North Kittitas and east King Counties (PDF 2MB)
- Area 2 -Yakima and south Kittitas Counties (PDF 1MB)
- Area 3 - Benton, Franklin, southeast Yakima, and southwest Walla Walla Counties (PDF 592KB)
- Area 4 - Asotin, Garfield, Columbia, and Walla Walla (all but southwest) Counties (PDF 759KB)
Southwest Region
166,800 electric vehicle
registrations in Washington in 2023, up from 114,600 in 2022.
87 wetland compensation sites
actively monitored on 918 acres in 2023.
25,000 safe animal crossings
in the Snoqualmie Pass East Project area since 2014.