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State of Washington Classified Job Specification


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Class Code: 518H
Category: Science & Engineering


Supervises and works with a crew performing arboricultural and tree maintenance work within the Washington State Parks.

Typical Work

Conducts initial tree evaluation and prepares tree map; 

Identifies suitability of trees for preservation and recommends modifications to preliminary land use plan to preserve suitable trees; 

Evaluates impacts to tree health and recommends specific design techniques for preservation; 

Performs skilled journey-level tree service work in technical tree climbing, controlled topping, and directional falling of large trees and snags, ornamental tree pruning and debris removal (chipping or stump removal); 

Develops and implements safety practices, procedures and leads work unit safety meetings; 

Maintains records on project work and summarizes into reports; 

Operates manlift, log skidder, d-4 dozer, seven- and ten-yard dump trucks with equipment trailers, trucks, boom trucks, portable sawmill and fork lifts; 

Uses brush chipper, spray equipment, stump grinder, power winch and rigging on horticulture project statewide; 

Performs other work as required.

Knowledge and Abilities

Knowledge of:  principles, practices and application techniques of arboriculture; methods, materials, tools and equipment used in technical tree service work; occupational hazards, special techniques and safety precautions applicable to tree climbing, topping, snag falling and heavy equipment operation, servicing and maintenance of equipment; mixing and application of pesticides. 

Ability to:  apply arboricultural techniques and forest stewardship practices; read, interpret, and work from plans, sketches, or verbal instructions; operate and maintain heavy equipment; use power saws; use tree climbing equipment and recognize tree defects constituting special hazards; maintain high standard of safety; sustain long periods of heavy physical exertion under hazardous conditions.

Legal Requirement(s)

There may be instances where individual positions must have additional licenses or certification. It is the employer’s responsibility to ensure the appropriate licenses/certifications are obtained for each position.

Persons legally authorized to work in the U.S. under federal law, including Deferred Action for Childhood Arrivals recipients, are eligible for employment unless prohibited by other state or federal law.

Desirable Qualifications

Four years of journey-level experience using technical tree climbing skills which includes at least one year of experience in operation of motorized construction or logging equipment.


International Society of Arboriculturists (ISA) certification, or a two-year technical degree in forestry, horticulture or arboriculture. An additional two years of experience performing journey-level arboricultural work may be substituted for the certification or technical degree.

Class Specification History

New class: July 10, 1998
Revised new class code and definition: (formerly 94065) effective July 1, 2007

Revised Legal Requirements; effective June 6, 2024, due to adopted legislative action.