When a healthy high-value City or ROW tree is removed, LMC 13.24.110 requires mitigation equal to the appraised value (ISA trunk-formula method) either as in-kind replacement trees or payment in lieu. Replacement trees in the ROW must be from the City's recommended species list, minimum 1.5-inch caliper, 15-gallon size, with two years of homeowner watering committed.
Mitigation under LMC 13.24.110 is calculated on a value basis, not a 1-for-1 count: the City Forester appraises the lost tree using the ISA trunk-formula and the applicant must replace that value. The Apply for a Permit page sets the planting standards for any replacement (and for any new tree in the ROW): minimum 1.5-inch caliper and 15-gallon container size; species must come from Longmont's recommended species list (city's tree-selection guidance is published by Forestry Services); applicants must contact Colorado 811 for utility locates before planting; and they must commit to 15 gallons of supplemental water per week per tree for the first two years. Planting and replacement work must be performed by a Longmont-licensed Tree Contractor (LMC 6.88).
Failure to install required replacement trees, or installing species not on the approved list or below minimum caliper/size, can void the Forestry permit and trigger re-installation at the owner's cost. Failure to provide 15 gallons/week of water for two years can shift replacement liability back to the owner if the new tree dies.
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