1  Introduction

Juvenile Coho Salmon

1.1 Project Rationale

The Kenai Peninsula’s watersheds are significant producers of Pacific salmon. Critical to Alaska’s economic and cultural wellbeing, these salmon support fisheries both inland and throughout Cook Inlet. Kenai Watershed Forum (KWF) in collaboration with The Kenai Peninsula Chapter of Trout Unlimited (KPTU) are documenting habitat for salmonid spawning, rearing, and migration in order to increase the known water bodies recognized in the Alaska Department of Fish and Game’s (ADF&G’s) Anadromous Waters Catalog (AWC). The AWC is Alaska’s most powerful tool for regulating, protecting, and conserving anadromous fish habitat statewide.

Salmon are intrinsic to the cultural and economic well being of Alaska, but cannot persist on the landscape without healthy habitat. Through strategic conservation efforts, riparian and instream habitat can continue to maintain salmon populations as well as transport marine-derived nutrients; maintain hydrology; and provide refuge during a rapidly changing climate.

In recognition of the importance of protecting anadromous fish habitat, the State of Alaska enacted Alaska Statute 16.05.8711, “Protection of Fish and Game”, which requires the state to list rivers, lakes, and streams important for the spawning, rearing, or migration of anadromous fish, while also requiring the prior approval of construction or use of said waterbody that may result in adverse effects on salmon populations. In response, ADF&G began overseeing the AWC whose data is now publicly hosted online for resource managers and interested members of the public to utilize. See Figure Figure 1.1 for ADFG’s online interactive map these data. Access the map at https://bit.ly/awc_map.

Figure 1.1: The Alaska Department of Fish and Game’s Anadromous Waters Catalog online mapper.

Each year, ADF&G solicits anadromous stream nominations from statewide efforts from the previous year. Once accepted, these nominations are incorporated into the AWC and its associated atlas. To date, the AWC includes nearly 20,000 anadromous streams, rivers, and lakes2, though it is widely understood that this number represents less than fifty percent of anadromous waterbodies throughout the state3. While ADF&G is conducting efforts to update existing data and survey for previously undocumented habitat, there remains a vast number of water bodies in need of surveying and habitat use observations.

In response, this project proposed to collect new observations of fish habitat and submit them for inclusion in the AWC. In 2025 we expanded the project scope to focus on developing an “end of anadromy” model for the Kenai Peninsula region, supported by fieldwork validation.

IN 2021 - 2023 KWF worked with KPTU to strategically prioritize survey sites to collect data for AWC nomination submissions. Site prioritization was based on criteria including the increase in protected anadromous fish habitat, accessibility, and alignment of priorities with local agency and partnership goals. These are described in greater detail in the methods section. KWF coordinated with local agency partners to ensure that fieldwork efforts were not unnecessarily replicated.

1.1.1 Anadromous Habitat Modeling

In response to the challenging scale of the task of ground-truthing many thousands of miles of anadromous streams, we are investigating methods to model probable anadromous habitat. If successfully developed, we anticipate that future managers and researchers will be able to consult these maps when reviewing permit applications, assessing habitat, or other applications.

Following methods described in Romey and Martin 2022 and others, in 2024 we applied existing end-of-anadromy modeling techniques to areas within the boundaries of the Chugach National Forest, where sufficient supporting geospatial data currently exists4. We report on these initial efforts in the Discussion section of this report. We are continuing and refining this approach 2025 -2027 with support from the National Coastal Resilience Fund.

1.2 Volunteer Training

In summer 2021 a half-day training workshop was conducted by Kenai Watershed Forum staff for fifteen Trout Unlimited volunteers, including but not limited to identifying ideal anadromous fish habitat; responsible deployment and retrieval of minnow traps; juvenile and adult fish identification; data collection and recording while in the field; and safe travel in bear country. Participants were introduced to an Anadromous Habitat Survey Standard Operating Procedure (SOP) document5. In summers 2022 - 2024, volunteers instead received training hands-on during fieldwork activities.

In summer 2025 KWF began coordinating with Cook Inletkeeper to expand public participation and outreach efforts under the “Backyard Salmonscapes” Local Solutions program.

Kenai Peninsula Chapter of Trout Unlimited Volunteers.

1.3 Objectives

  • Submit nominations to increase anadromous stream, river, lake, and wetland coverage in the AWC and corresponding atlas

  • Revise or corroborate outdated AWC and atlas data, particularly on Kenai River tributaries experiencing increases in zinc concentrations as well as priority corridors identified by the Kenai Mountains to Sea partnership

  • Explore the feasibility of applying predictive modeling techniques for anadromous habitat within the Kenai Peninsula Borough

  1. http://www.adfg.alaska.gov/index.cfm%3Fadfg=habitatregulations.prohibited↩︎

  2. https://www.adfg.alaska.gov/sf/SARR/AWC/index.cfm?ADFG=main.home↩︎

  3. https://www.adfg.alaska.gov/sf/SARR/AWC/index.cfm?ADFG=nomSubmit.about↩︎

  4. https://paperpile.com/shared/sjm~9ORhFQSmRxQx6f0JVpg↩︎

  5. https://bit.ly/kwf_awc_sop↩︎