This PDF file includes:

• fig. S1. Radiocarbon sequence for DhRp-52.
  
• fig. S2. Plan view of SRP feature from garden area.
  
• fig. S3. Sample of conserved wapato (S. latifolia) tubers excavated from DhRp-52 wet-site deposits.
  
• table S1. Radiocarbon dates from DhRp-52.
  
• table S2. Frequency and distribution of abundant seed taxa in the garden deposits at DhRp-52.
  
• table S3. Total counts of perishable artifacts from DhRp-52.
  
• table S4. Species identification of a sample of perishable artifacts excavated from DhRp-52 wet-site (area II) deposits.

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