Depth bands are ecological, not evenly spaced — they mark the surf zone, the band bull kelp actually occupies, and the inner shelf the reserve protects. Vertical scale is non-linear: the water column is shown at full scale and the coastal hills are compressed (land ×0.55 power), or 300 m of Cape Foulweather would flatten an 18 m reserve to a sheet. Seafloor provenance: 99% of this frame comes from GMRT's high-resolution multibeam sounding compilation at ~43 m per cell; the rest is interpolated from a coarser background grid. Depths are relative to approximately mean sea level with no tidal reduction — on a shore with a 2–3 m tidal range the waterline on these flats is datum-dependent, and the sea stacks the grid cannot resolve (Gull Rock, Otter Rock) read as shoals here while standing above water in fact.

Surficial Geologic Habitat v4 (OSU Active Tectonics lab / Oregon DLCD), the state's CMECS-classified inventory of its own nearshore — mapped since 2016. 73% of this frame classifies; where the layer is blank the seafloor is unmapped, not bare. Species icons share one dived survey band (3–17 m, PISCO): what separates them on this map is place, not depth.

West Coast Canopy Kelp Persistence (Oregon DLCD, Dec 2024), from the Landsat canopy time series behind Kelpwatch (Bell, Cavanaugh et al.) — 30 m pixels, seasonal, 1984 onward. 137 canopy pixels intersect this frame; the brightest have shown canopy in 40 seasonal scenes. Persistence is how often canopy was seen across the record — not biomass, not density, and not a current-year observation. Drawn at the waterline, where a bull-kelp canopy actually sits; the holdfasts are on the rocky shelf below.

Heat stress is NOAA Coral Reef Watch's global 5 km product — built for coral but the same marine-heatwave signal that stresses a kelp coast. Current is the ~25 km geostrophic field from altimetry: it does not resolve surf-zone or tidal flow, which is the water this reserve actually feels. Absence of AIS is not absence of fishing — the nearshore dory and charter fleet is mostly too small to carry it.