Jalama Creek Watershed (Santa Barbara County, California) Habitat Assessment Data, Collected October - November 2022.

For each assessed habitat unit, the habitat type, total length, and dominant substrate composition was recorded. Substrates were chosen from the following list which specifies substrate types by mean diameter: Silt/clay, sand, gravel (0.08-2.5 inches), small cobble (2.5-5 inches), large cobble (5-10 inches), boulder/cobble (>10 inches), and bedrock. If the habitat unit type was a pool, mean and maximum water depth, mean tail-out water depth, dominant tail-out substrate type, and mean tail-out substrate embeddedness were also recorded. Embeddedness was recorded as a number between 1 and 5. On this scale, a value of 1 is for embeddedness between 0-25%, 2 is for 25- 50%, 3 is for 50-75%, 4 is for 75-100%, and 5 is for substrate that is unsuitable for O. mykiss redds (silt, clay, boulder, or bedrock). For 100% units, additional measurements and data were recorded as specified by the CSSHRM. These additional measurements included the mean wetted width and water depth. A count of large woody debris (LWD) present within and adjacent to the unit below the bankfull markings of the channel were also recorded. LWD was defined as having a diameter greater than one foot and a total length over six feet and was further divided into two categories by length: between six and 20 feet or greater than 20 feet. Each 100% unit was also given a shelter rating to identify the amount and diversity of potential shelter opportunities for fish. Shelter ratings were scored between 0 and 3, with a rating of 0 indicating no suitable shelter and a rating of 3 indicating the presence of abundant and complex instream shelter types. Shelter composition was also broken down into percentages by category to better characterize the quantity and types of shelter present within habitat units. Shelter types assessed included undercut banks, small woody debris (SWD), LWD, root mass, terrestrial vegetation, aquatic vegetation, bubble curtain, boulder/cobble, and bedrock ledges. Visual estimation was utilized to assess the amount of exposed substrate as well as the dominant bankside substrate composition and vegetation types present in each 100% habitat unit. The amount of exposed substrate within 100% habitat units was expressed as a percentage of the total wetted area of the unit. Overall bankside vegetation coverage was also expressed as a percentage for 100% units. Canopy cover was measured for every 100% unit and every third habitat unit assessed, regardless of whether it was a 100% unit or not. Canopy cover was quantified as a percentage using a spherical densiometer at the upstream extent of these units. This percentage was further broken down to distinguish between cover occurring from deciduous and evergreen vegetation types. Finally, sections of stream channel void of surface streamflow were recorded as “dry units” and the only data point measured for these units was length.