Garden Lake Park

Slide 1
Our community-based habitat restoration efforts began with a project at Garden Lake Park. In 2006, an Oregon Watershed Enhancement Board (OWEB) grant provided funding for 3 years of manual and mechanical removal of Himalayan blackberry, English ivy and Scot's broom and the regeneration of native plant species across 11 acres of forests, ponds and wetland habitats in this city park.

Slide 2

Over 250 Creswell elementary students participate in Creswell's Annual Earth Day event at Garden Lake Park. Many communitiy organizations host activities along with classes from the Creswell middle and high schools. An All Species Parade is also included in the Annual Earth Day festivities. The Ron Pettiti Memorial Pavillion, built in 2009, features interpretive watershed education signage and is the hub of activity at Garden Lake Park.

Slide 3

Our current focus at Garden Lake Park is water
quality and pond conditions. The Williams Company supported our request to conduct an evaluation of pond debris, conditions, and monthly water quality sampling. Our intention is to make a preliminary technical evaluation of possible limiting factors to the aquatic habitat to the City of Creswell and other partners by early 2013.

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Garden Lake Riparian Restoration Project

Garden Lake was identified as a priority area as it had seen the excavation of gravel for the construction of 1-5 creating a series of ponds in line with Hill Creek but was now in public ownership. Blackberry, Scot’s broom and English ivy were preventing the integrity and re­establishment of habitats at the park.


Invasive species were removed. We used remnants of reference ecosystems on site to guide our planting choices. A diversity of species were planted, not just trees. City of Creswell allocated staff time to water the trees and shrubs in the park


Infestations of Scot’s broom, English ivy, and Blackberry were all significantly reduced in scale and extent on the 11 acres of project area. Invasive plant removal and the planting of native trees/shrubs improved eleven acres of riparian habitat. Watering happened efficiently and seemingly cost-effective, and plant survival was far improved thanks to this effort.

January 14, 2008
February 19, 2009

Forest and Wetland Enhancement

Now robust with wildlife and outdoor opportunities within walking distance of Creswell, Garden Lake Park was just an old gravel pit covered in blackberries alongside Interstate 5 less than 12 years ago. During the construction of I-5, gravel was mined from this site creating a series of ponds. Improvements at the 34 acre Garden Lake Park were initially spearheaded by the late Mayor Ron Petitti and the Creswell High School Key Club liaison Anne O’Connell and her students. Then in 2006, the Coast Fork Willamette Watershed Council secured funds to conduct a large-scale habitat enhancement project. An Oregon Watershed Enhancement Board (OWEB) grant provided funding for 3 years of manual and mechanical removal of Himalayan blackberry, English ivy and Scot’s broom and the reestablishment of native trees and shrubs across 11 acres of forests, ponds, and wetland habitats in this city park.

The Coast Fork Willamette Watershed Council intentionally chose to use a non-chemical weed removal method on this first large-scale vegetation enhancement project which included treatment of Himalayan blackberry, English ivy, and Scot’s broom over 11 acres. This required the use of highly skilled crews, primarily with Walama Restoration Project, who cut and then grubbed out the roots in both open areas and within the poison oak-infested understory. We repeated treatment over a minimum of two years in each area then returned to conduct maintenance with volunteers. After this site preparation, we planted trees and other native species in key locations of Garden Lake Park. This hands-on approach to restoration minimized impacts to the understory vegetation, allowing natural recovery after invasives were removed especially in areas of the park that contained mature native species mixed with non-natives. Invasive removal occurred in the fall months, planting of native species took place in the late winter, and the plantings were watered in the summer. The project plan was tailored to the various distinct sections of the project, including stream areas, a peninsula, and a central area.

Native tree and shrub species planted to enhance habitats at Garden Lake Park include black cottonwood, big-leaf maple, Oregon ash, Oregon white oak, red alder, willows, osoberry (Indian plum), Oregon grape, red-osier dogwood, snowberry, Douglas spirea, large-leaf lupine, and slough sedge. The park also features good stands of these native plants common camas, cow parsnip, stinging nettle, and the infamous, but native, poison oak! Photopoint monitoring of the completed planting areas will be used to document project success through 2014.

Wildlife species that benefit from restoration at Garden Lake Park include cutthroat trout, Western pond turtle, bald eagle, migrant songbirds, osprey, great blue heron, great egrets, American coot, double-crested cormorants, Canada geese, ducks, snakes, raccoons, possum, skunk, beaver, and otter.

10 Years of Stewardship

Improving this valuable open space became an opportunity for students to become stewards of this park and their community. Trail improvement and habitat maintenance occurs annually with coordination by the Creswell RARE planner and the Creswell High School with support from volunteers from businesses, individuals, and the Coast Fork Willamette Watershed Council. After the loss of Mayor Ron Petitti in 2008, many community organizations and leaders came together to honor the inclusive community spirit of the Mayor with the construction of an educational pavilion which was completed in 2009. This park improvement and watershed signage provided a great platform for a student-focused Earth Day event which began in 2010 as the next step in the evolution of this community effort. Further interest resulted in the construction of two foot bridges which connect the park to the Emerald Valley development by the Ford Family Leadership class. After 10 years of ongoing volunteer-based habitat and trail maintenance at this Creswell site, it is safe to say that the Coast Fork’s effort to secure funding for habitat restoration in 2006 was instrumental in building the momentum necessary for this ongoing community action on this site.

Hydrology of Garden Lake

The three ponds at Garden Lake Park are within the historic floodplain of the Coast Fork Willamette River. Significant gravel deposits found there were mined for the construction of Interstate 5 which formed the ponds. The park is 2 miles upstream from the Hill Creek confluence with the lower Coast Fork Willamette River. I-5 forms the western boundary of the park and the Emerald Valley housing development forms the eastern park boundary. The northern boundary of the park is shared with two small farms. The southern boundary of the park includes the Hill Creek riparian corridor.

Prior to the construction of I-5, significant alterations were made to Hill Creek, as the flow was directed out of the natural channel and made to intersect with a system of irrigation canals before entering Creswell city limits. The modern Hill Creek is fed by the natural channel when flows are allowed down it (there is full control of this creek at the top of the Davisson Road diversion structure), by flow augmentation of the irrigation canal (that connects to the mainstem Coast Fork), as well as by storm water runoff (that passes under I-5 and into the park), and precipitation.

Water Quality Concerns in Hill Creek

Currently, there are water quality issues in the ponds at Garden Lake Park. Due to community concerns about late-summer algae blooms, warm temperatures, and storm water runoff entering the ponds, the Coast Fork Willamette Watershed Council will conduct an evaluation of pond depths, conditions, and water quality by conducting monthly sampling of several sites in 2012. It is our intention is to make a preliminary technical evaluation of possible limiting factors to the aquatic habitat to the City of Creswell and other partners by early 2013. This technical evaluation is necessary in order to begin a dialogue about possible restoration actions that would address these possible water quality problems. There are potential solutions to these problems that could be installed at Garden Lake Park or within the Hill Creek system. Landowners within the Hill Creek system who are interested in irrigation efficiency, fencing livestock away from sensitive wetlands or streams, obtaining help with managing their septic systems, or restoring stream or wetland habitats are encouraged to contact the Watershed Council.

Hill Creek/Garden Lake Issues:

  • The appearance of algae in late summer may be influenced by:
    • nutrient runoff into Hill Creek or historic deposits in the pond (nutrient sources range from fertilizer, manure, to septic overflows)
    • reduced flow from natural sources due to legal and illegal water use upstream, as well as loss of wetlands which provide late-season release and the recharge of springs
    • increased temperatures in the Hill Creek system due to a loss of streamside (riparian) vegetation and loss of wetlands
  • A full fish passage barrier at Bald Knob mill due to failure of the historic dam at that site

Technical Information


Project Partners

City of Creswell
Creswell School District
Walama Restoration Project
Friends of Garden Lake Park
Oregon Department of Fish and Wildlife (ODFW)
Oregon Watershed Enhancement Board (OWEB)
Oregon Parks and Recreation Department (OPRD)
The Williams Company
Emerald People’s Utility District (EPUD)
Creswell Boy Scouts and Eagle Scouts

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