Jackson Bottom Wetlands Preserve

Jackson Bottom Wetlands Preserve
Name	Jackson Bottom Wetlands Preserve
Location	Hillsboro, Oregon, United States
Coordinates	45.512, -122.985
Area	635 acre
Established	1990s (public access)
Governing body	City of Hillsboro
Website	https://www.hillsboro-oregon.gov/our-city/departments/parks-recreation/jackson-bottom

Jackson Bottom Wetlands Preserve is a protected wetland area located within the Tualatin River floodplain in Hillsboro, Oregon. Managed by the City of Hillsboro, the preserve serves as a vital habitat for native flora and fauna while offering extensive environmental education and passive recreation opportunities to the public. Its establishment represents a significant community effort in wetland restoration and conservation within the rapidly developing Portland metropolitan area.

Geography and location

The preserve is situated in the Willamette Valley region, directly adjacent to the Tualatin River on its southern boundary. It lies within the city limits of Hillsboro, Oregon, approximately west of downtown Portland. The landscape is characterized by a mosaic of open water, emergent marshes, forested wetlands, and upland areas, shaped by the seasonal flooding patterns of the Tualatin River. This location within the river's floodplain is central to the site's ecological functions and hydrology, connecting it to the broader Tualatin River National Wildlife Refuge watershed system.

History and establishment

The land was historically used for agriculture, including dairy farming and crop production, following the settlement patterns of the Willamette Valley. In the 1970s, the City of Hillsboro began acquiring parcels with the vision of creating a wastewater treatment facility and mitigating flood risks. Public advocacy, led by local conservationists and supported by organizations like the Tualatin Riverkeepers, shifted the focus toward preservation and restoration. A pivotal partnership with the United States Army Corps of Engineers facilitated major hydrological restoration projects in the 1990s, formally establishing the area as a public wetland preserve dedicated to conservation and education.

Ecology and wildlife

The preserve supports a highly diverse ecosystem typical of Pacific Northwest freshwater wetlands. It is a regionally important site for migratory birds along the Pacific Flyway, hosting species such as the great blue heron, tundra swan, and northern pintail. Resident wildlife includes beaver, river otter, and the endangered Oregon chub. The varied habitats support a rich plant community, including stands of Oregon ash, black cottonwood, red-osier dogwood, and extensive areas of cattail and bulrush. This biodiversity is monitored through partnerships with entities like the Audubon Society of Portland and Portland State University.

Wetland functions and hydrology

As a functional floodplain wetland, the preserve performs critical hydrological services for the Tualatin River basin. It acts as a natural sponge, storing and slowly releasing floodwaters from the Tualatin River, which reduces flood damage downstream in communities like Hillsboro and Tualatin. The wetlands also improve water quality by filtering sediments and pollutants from agricultural and urban runoff through natural processes. Water levels are managed through a system of dikes, pumps, and controlled outlets, a legacy of the restoration work done with the United States Army Corps of Engineers.

Recreation and education

The preserve offers over of trails, including a paved, accessible path to an observation deck and the Jackson Bottom Wetlands Preserve Education Center. The education center, operated by the City of Hillsboro Parks & Recreation Department, hosts school field trips, public workshops, and citizen science programs, often in collaboration with Oregon State University Extension Service. Popular activities include birdwatching, photography, and guided nature walks. The preserve is a key site for events like the annual Hillsboro Bird Festival and educational partnerships with the Tualatin Hills Park & Recreation District.

Management and conservation

Primary management and stewardship are conducted by the City of Hillsboro with support from the nonprofit Friends of Jackson Bottom Wetlands. Ongoing conservation work involves invasive species removal, such as controlling Himalayan blackberry and reed canarygrass, and native habitat enhancement projects. The management plan aligns with broader regional goals set by the Clean Water Services and the Tualatin River Watershed Council. Long-term conservation is secured through legal protections and its integration into the Tualatin River National Wildlife Refuge complex, ensuring its preservation amidst regional growth pressures.

Category:Protected areas of Washington County, Oregon Category:Wetlands of Oregon Category:Parks in Hillsboro, Oregon