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In WRIA 11 (Nisqually), the floodplain extent was generated using the floodplain extent mapped in Puget Sound Partnership's (PSP) Floodplain Vital Sign web application. The final list of salmon recovery priority areas consisted of the Nisqually River mainstem downstream of Alder Dam, Muck Creek and its tributaries, Ohop Creek downstream of Ohop Lake, and Mashel Creek. Additionally, the fish-bearing reaches of South Creek and Lacamas Creek were added as salmon recovery priority areas from the Statewide Integrated Fish Distribution (SWIFD) database (buffered by 200 ft.) based on feedback from floodplain experts.

Since WRIA 12 was not included in PSP's floodplain extent layer, the floodplain extent was created using the WRIA 10/12 core habitat and flood protection corridor as delineated by the Puyallup and Chambers Salmon Recovery Lead Entity. Chambers Creek was the only reach categorized as a salmon recovery priority area.

For WRIA 10 (Puyallup – White), a blend of these two methods was used to create the floodplain extent. The WRIA 10/12 core habitat and flood protection corridor was used as the floodplain extent downstream of the White-Puyallup confluence, as well as for the White River downstream of its eastern intersection with the County boundary northeast of Lake Tapps. Upstream of these areas, the maximum extent of the PSP Floodplain Extent and the WRIA 10/12 core habitat and flood protection corridor was used to create the floodplain extent. Additionally, fish-bearing streams from the SWIFD database (buffered by 200 ft.) were appended anywhere it was not already included within the floodplain extent. Lastly, any streams designated as critical habitat were buffered by 200 feet and appended to the floodplain extent layer if not already included. The final list of salmon recovery priority areas in WRIA 10 consisted of the Puyallup River, White River, Carbon River, Clear Creek, Clarks Creek, Fennel Creek, Kapowsin Creek, Voight Creek, South Prairie Creek, Wilkenson Creek, Clearwater River, Greenwater River, and Huckleberry Creek.

Neither the PSP floodplain extent nor the WRIA 10/12 core habitat and flood protection corridor included WRIA 15. Therefore, fish-bearing streams from the SWIFD database (buffered by 200-ft) were used as the floodplain extent for WRIA 15. No salmon recovery priority areas were identified for WRIA 15.