Structured Removal


2016 Structured Removal Maps:

What is Structured Removal of ash?

In response to the growing emerald ash borer infestation, The City of Saint Paul has, since 2010, employed the "Structured Removal" of ash in order to strategically reduce the total percentage of ash trees on boulevards and in parks throughout Saint Paul.


How are trees selected for structured removal?

The focus for structured removal is on areas that were planted in a nomenclature of ash. Trees that are declining from non-EAB related symptoms such as drought, salt injury, mechanical injury, and structural defects are selected for structured removal. In general, ash trees become brittle and drop many branches while reaching maturity and are a source of common complaints from residents.

Why are you removing live trees?

Most of the ash trees selected for structured removal are still alive but in a state of irreversible decline. Ash trees in this declining state will be removed at an increased rate in the future as EAB continues to spread. Delaying the necessary removal of ash trees from the urban forest will only compound the cost and labor of removal for future generations.


Why not save the trees with insecticide treatments?

Forestry treats a portion of the high value ash trees on boulevards and in parks that meet the following criteria:

  • Within one mile from a known EAB infestation
  • Between 10-20" diameter at breast height (DBH)
  • In good health with no known defects
  • No visible conflicts with utility wires, street lights, or roadway clearance.

What happens to infested ash trees?

In Saint Paul, publicly owned EAB infested trees are removed and will continue to be removed as they are identified. 

What happens once ash trees in the structured removal program are removed?

  • Ash trees are removed between January and April.
  • Tree stumps are removed during the spring starting once the snow melts and the ground has thawed.
  • A variety of new trees, with a minimum of two species per block, are planted to replace the ash trees, generally at a ratio of 1-to-1, following the general boulevard tree planting criteria.
  • Forestry will leave a door tag at all homes receiving new boulevard trees with information on the type of tree as well as how to care for and maintain the tree. Saint Paul Forestry annually hires tree planting contractors to replant boulevard trees in the spring from the time the ground thaws until June 15 and in the fall from October 15 to the time the ground freezes.
  • Property owners receiving new boulevard trees may request one tree watering bag per boulevard tree by contacting Forestry.