Preserving America’s canopy with actionable tree intelligence

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Tree Risk Assessment

Arborist walking through a path lined with trees

Unhealthy and damaged trees can often pose a significant risk to people and property, which is why a tree risk assessment is so crucial to ensuring the safety of your employees, visitors and guests. We perform industry standard tree risk assessment. Following the American National Standard for Tree, Shrub, and Other Wood Plant Management – Standard Practices (Tree Risk Assessment a. Tree Failure), also known as ANSI A300 Part 9. We assess trees using the formula Probability x Consequences = Risk.

table showing tree risk assessment formula

Table 1 – Tree Risk = Probability x Consequences

The 3 Levels of Risk Assessment

levels of tree risk assessment

  • Level 1: Limited Visual Tree Risk Assessment
    This is used when the tree will be viewed from a defined, limited perspective. It consequently has limitations as to which risks it may detect. This view may include an aerial patrol, a drive by windshield survey, a foot patrol or photographs.
  • Level 2: Basic Tree Risk Assessment
    This level involves looking at the tree’s roots, trunk and crown to detect structural defects. It is a 360 degree, ground-based visual observation of the tree.
  • Level 3: Advanced Tree Risk Assessment
    This level is anything in excess of level 2. It may include tissue testing, drone inspection and resistance drilling.

Our tree risk assessments are usually part of a Tree Management Plan for residential, business or academic campus properties. We have a number of ISA Tree Risk Assessment Qualified Consultants ready to perform industry standard tree risk assessments.

Tree Risk Mitigation

After potential targets are identified, our consulting arborists will provide a range of options to mitigate damage risks. There are essentially four options – removing the target, treating the tree and treating the target. Removal is always a last resort if no other options are available.

Tree Risk Targets

how tree risk is calculated

Photo 1 – A tree fails; the area impact is a radius equal to the height of the tree.

Photo 2 – The yellow arrow points to a large area of impact. The red arrow shows a smaller tree with an equal risk rating because it is located near walkways, structures and a parking lot.

Contact us today to find out how our Consulting Group can help protect your property.

For more information on Tree Risk Assessments, please watch this informational video from Mike Galvin, SavATree Consulting Group Director.


Tree Risk Assessment Clients:

The Maryland National Capital Park and Planning Commission
The Maryland-National Capital Park and Planning Commission
whiting turner logo
town of bedford ny logo
Town of Bedford
city of aurora CO logo
City of Aurora
gorman and williams logo
Gorman & Williams
Village of Addison IL logo
Village of Addison
village of morton grove il logo
Village of Morton Grove
the peddie school logo
The Peddie School
town of winchester CT logo
Town of Winchester
Mike Galvin
Director, The Consulting Group at SavATree

Mike Galvin’s wide-ranging expertise in arboriculture includes urban and community forestry management, state-of-the-art tree inventory and management plans, tree protection and preservation during construction, as well as tree risk management and appraisals.

He is an accomplished speaker, researcher and published author on environmental and sustainability issues.

Mike currently serves as Strategic Partner for the Sustainable Urban Forests Coalition, has served as Past President of the American Society of Consulting Arborists and the Mid-Atlantic Chapter of the International Society of Arboriculture and served on the Chesapeake Bay Urban Tree Canopy Expert Panel.
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Matt Weibel
Consulting Arborist at SavATree

Matt has worked in arboriculture and urban forestry since 2002. He received a Bachelor of Science in Natural Resource Management from Rutgers University in New Brunswick, NJ. He has experience working on residential, private, and commercial landscapes and with municipal governments.

Matt is a member of the American Society of Consulting Arborists, International Society of Arboriculture, New Jersey Arborists Chapter of the ISA, and the New York State Urban Forestry Council.

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Allan Fenner
Consulting Arborist at SavATree

Allan Fenner has a wide range of arboricultural and urban forestry experience that includes the preparation of tree preservation plans, construction specifications, urban tree inventories and municipal tree preservation standards for road and side walk construction. He has managed multiple university campus inventory and construction projects as well as contributes to design and implementation. Allan integrated the use of ground penetrating radar for qualitative tree root assessment below ground in urban settings for the development of construction specifications in Connecticut. He has managed several large projects that included the implementation of tree preservation specifications and the installation of detailed infrastructure. He is an accomplished speaker and educator and serves as a member of the Board of Directors for the Connecticut Tree Protective Association. He is a qualified tree risk assessor and experienced in landscape planning, appraisal, forensics, damage assessments and expert witness testimony.

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Steven Geist
Consulting Arborist at SavATree

Steve has been a practicing and consulting arborist since 1983. He double majored in Plant Pathology and Botany at Colorado State University in 1983. Steve has participated in complex legal matters as an expert witness for a variety of clients including property owners, attorneys, corporations, real estate appraisers, insurers, city, county, state, and United States government. He is currently the Board Chair for the Tree Research and Education Endowment Fund. Steve is also past president of the American Society of Consulting Arborists, Society of Commercial Arboriculture and the Rocky Mountain Chapter of the International Society of Arboriculture.

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Daniel Bunner
Consulting Arborist at SavATree

Dan works out of SavATree’s Springfield, VA branch. His primary focus areas for consulting services are the Washington DC metro area and Northern Virginia.

He is an ISA Certified Arborist and Tree Risk Assessment Qualified.

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Jean Zimmerman
Consulting Arborist at SavATree

Jean has worked in project development, helping municipalities, colleges, botanical gardens and others manage their forests. Jean and the team can help your property to be beautiful and healthy to impress clients, employees, visitors and guests.

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Brock Eastlund
Consulting Arborist at SavATree

Brock joined the SavATree team in 2016, bringing with him several years of experience working with clients, providing high-quality tree care and lawn care, including turf grass management.

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Gary Eichen
Consulting Arborist at SavATree

As our Troy, MI branch’s PHC and Lawn Manager, Gary covers all 762 square miles of the location’s territory. He provides expert tree service, lawn service, organic lawn care, tree pruning, tree removal, fertilization and more.

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