Cold Creek is a very small creek used as a reference site for the project. The site is spring fed.

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Agricultural, equestrian, and ranch land up stream of where the wash meets Sherwood Lake. Hidden Valley Wash substrate is comprised mostly of silt. There were some invertebrates and vertebrates found at sampling site.

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The sampling site at Liberty Canyon Creek is a small concrete channel that flows through residential areas. Due to channeling of the creek there is little or no vegetation growing on the banks or the creek itself. There is however some patches of vegetation growing in cracks in the concrete channel. The stream bottom is thinly coated with algae.

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Lindero Creek 1 is a small creek that runs through property owned and managed by the Lindero Country Club, while the upper reach runs through residential areas. Portions of the creek along the golf course are concrete lined, which changes to soft creek bottom just before the sampling site. The creek continues down through the golf course, crosses Thousand Oaks Blvd and eventually flows into Lake Lindero. Stream-side and in-stream vegetation consist of Cattails and Willows. During dryer months the stream may not be visible due to overgrowth of vegetation.

Lindero Creek 2 flows from a concrete ramp off Lake Lindero Dam, which continues into a concrete lined channel. The creek eventually flows into an underground tunnel where it meets Medea Creek. The creek is lacking in vegetation due to concrete channeling of the system. There is however, some vegetation growing in the sedimentation but the channel bottom is covered mostly with algae. 

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The Las Virgenes Creek 1 sampling site is located where natural riparian and stream substrate make a transition to concrete channeling. The stream substrate contains algae covered sediment and silt. Bank stabilization is very poor in the immediate sample site. 

At Las Virgenes 2 the stream has a natural low gradient with a sandy rock gravel substrate. The stream contains some undercutting and shallow gravel beds with a good canopy cover. Aquatic invertebrates were found to be abundant at this sampling site. Trash was found on the banks on all sampling events.

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Malibu Creek is the catch point of all drainage in the watershed. The creek contains a good mixture of sand, gravel, large rocks and boulders. The banks are heavily vegetated with willows and cottonwoods, as well as exotic species. No in-stream vegetation is found at the site other than algae.

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The sample site at Medea Creek 1 is a concrete channel which runs through a residential area. The majority of the creek is left natural but portions (areas that flow under road bridges) are concrete lined. Portions of the creek banks are left natural but some walls of the creek were reinforced with rock and concrete riprap. The banks contain natural and introduced plant species. Cattails and Willows can be found growing along the stream bank. Algae is often in abundance, floating on the surface of the stream, on submerged rocks and on the substrate. Trash lines the bank of the streams at and around the sample area.

Medea Creek 2 is a moderate size stream that flows into Malibou Lake. The stream is a natural low gradient with sand, rock gravel mix and large rocks. The stream contains undercutting, good canopy cover, a variation of runs, riffles and pools, and shallow gravel beds, which is near pristine conditions for aquatic invertebrates which are found in abundance at the site.

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Potrero Creek is a concrete lined channel that flows into the Westlake Lake. This site is only monitored after substantial rainfall due to lack of flow most of the year.

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Russell Creek is a small concrete channel that flows through commercial and residential areas along Lindero Canyon Road. Due to the concrete channeling of the creek, there is little or no vegetation growing on the banks and the stream bottom is covered or matted in algae. Due to the location of the creek trash is consistently found in stream and along the upper banks.

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Triunfo Creek is a moderately sized creek which flows from Westlake Lake over the dam. The creek bed may seem to appear natural but is actually a boulder and concrete lined bed which is now covered with natural rocky substrate. Triunfo Creek receives runoff from Westlake Lake upstream of the sample site. Triunfo Creek and its banks contain diverse species of plants and animals which includes native and exotic invasive species. Native and non-native trees also line the banks of the creek, providing excellent shade, cooling and bank stability. 

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