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Tree Work Along Boulder Creek Path Near Scott Carpenter Park Scheduled Nov. 14 to 16

 A full restoration plan is developed for replanting

The City of Boulder Forestry Division will remove a number of ash and non-ash trees along the Boulder Creek Path adjacent to Scott Carpenter Park, from the southwest corner of the park upstream to 28th Street, Nov. 14 to 16, weather permitting. This tree work is taking place to mitigate safety issues caused by the potential for falling limbs from dead and dying trees. Of the 59 trees identified for removal, 42 are ash trees affected by Emerald Ash Borer (EAB); 24 trees are larger than 7 inches in diameter.

The work will require a closure of the Boulder Creek Path in this area; the path will be closed 8 a.m. to 4 p.m. each day. Pedestrians and cyclists using the path will be detoured on the west side of 28th Street, along the multi-use path north to Arapahoe Avenue around the work zone. Signage will be on site to ensure public safety and to guide pedestrians and cyclists.

Although valuable environmental benefits and services will be lost as the naturalized ash trees die and are removed, these removals present an opportunity to restore these areas with native vegetation that will better support local wildlife, are more adapted to local climate and less susceptible to pests and diseases. After removal, staff will manage the area to mitigate the spread and growth of invasive species while a full restoration plan is developed for replanting. This plan will outline native and adapted tree and/or shrub species for replanting and locations within the creek corridor combined with native grass seeding.

As ash trees sprout back profusely when removed, impairing restoration efforts, stump removal is necessary to prevent new growth, to avoid having to return to the site to remove suckers and to allow new native plant material from restoration efforts to establish long-term. Forestry staff will attempt to grind tree stumps mechanically when appropriate. When stump grinding is not feasible, the stump will be hand-treated with the herbicide imazapyr (Habitat®) necessary to prevent regrowth. Habitat® is the least toxic and most effective option. When treating a stump, staff will apply by hand to a small area around the very edge of the stump, right below the bark. A blue dye is added to the herbicide for more precise application to minimize non-target exposures. Staff will post signage in the work areas when this stump treatment is required. For more information about the ash tree removals along Boulder Creek, please visit

EAB, an invasive wood-boring beetle, attacks all North American ash (Fraxinus spp.) not protected by pesticides. Now present in 35 other states, EAB has killed hundreds of millions of ash trees over the past two decades. All public and private ash trees in Boulder are currently at risk. Declining public and private ash trees will require removal before they present an unacceptable level of risk to public safety. As EAB populations in Boulder continue to increase, ash trees are expected to die at an accelerated rate. Residents can expect to see increasing numbers of ash tree removals along Boulder Creek, and across the city, over the next several years by various impacted property owners To learn more about the City of Boulder EAB Plan, please visit

The city would like to remind residents that when contracting the removal of a tree on their property, they should be sure to use a tree care company licensed through the City of Boulder. A list of licensed arborists and more information about the Boulder Forestry is available at

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Published: Nov. 9, 2018 

Media Contacts: 
Denise White, Parks and Recreation Communication Specialist, 303-413-7258 
Patrick von Keyserling, Communication Director, 303-441-4959