Minto-Brown Island Park Floodplain Restoration

This project improved riparian habitat and water quality by transforming 166 acres of floodplain farmland within Minto-Brown Island Park into a diverse, resilient assemblage of native Willamette Valley floodplain vegetation communities.

ESA provided large-scale restoration planting design, hydraulic modeling, public involvement, NEPA documentation, bidding services, and construction observation services to transform 166 acres of floodplain farmland into a diverse, resilient assemblage of native Willamette Valley floodplain vegetation communities. These communities include oak savannah, upland prairie, wet prairie, mixed woodland, ash woodland, and willow slough.

The ESA team researched pre-settlement conditions by reviewing Government Land Office maps from 1862. This involved collecting historic aerial photographs depicting flood events and assessing known flood surface elevations in relation to existing topography. ESA also scoured the untended areas of the park to observe remnant species, natural regeneration, and re-colonization by natives.

A series of public meetings provided opportunities to communicate findings and gather ideas and preferences for proposed habitat types from park users. Revegetation was carefully planned to protect existing trails, parking areas, and view corridors within the park while supporting current uses and circulation patterns.

Based on feedback from the meetings, ESA designed large-scale planting plans that leveraged agricultural techniques to prepare the site, install plant materials, and maintain the plantings. Plans called for the installation of over 60,000 trees and shrubs, 30,000 herbs and bulbs, and the application of six custom seed mixes. To ensure success at this large scale, ESA included three seasons of specified maintenance into the bid documents.

ESA worked closely with NRCS, the City of Salem, and the contractor to respond to questions and engage in an adaptive management approach to address changing weather conditions, plant material availability, and unfolding site conditions. ESA has subsequently led stakeholder site tours to observe the successful establishment of floodplain vegetation.