Sampling Sites: 2008-2009

The 2008-2009 water year sampling sites consist of both new and existing sampling sites. Sites were chosen by UCD and NCRWQCB to refine the spatial and temporal impairment of the Russian River and Santa Rosa Creek in order to develop pathogens TMDL's for this system. These sites are monitored for the presence of Bacteroidales, E. coli and Enterococcus. The sites were chosen to reflect a mix of land uses, watershed position, potential cumulative effects, spatial coverage, as well as previous monitoring activity. There are presently two semi-natural controls (Upper Mark West Creek and Mill Creek), two agriculturally dominated reaches (Atascadero Creek at Bodega Hwy and Lower Dry Creek), four urban (Copeland and Foss Creeks, Upper Santa Rosa Creek and the downstream Prince Memorial Greenway), and four mixed land uses (Laguna de Santa Rosa and the Laguna downstream of Santa Rosa Creek, and lower portions of Green Valley and Atascadero at GVR Creeks). Please see the initial findings of Shilling et al. 2008 for a discussion of previous monitoring results.


Atascadero Creek at Bodega Highway

Atascadero Creek at Bodega Highway
SiteID: RBATA004
Lat: 38.39747
Long: -122.8482

Site Characterization

Field Observations

Vegetation

This site has very low tree cover (3%) of willow (Salix sp.; 5.26m tall), alder (Alnus sp.), and walnut (Juglans sp.; 15.23m tall). The site is dominated by Himalayan Blackberry (Rubus discolor; 70%) and was not very species rich at the time of sampling. Total Cover: 75%

 


Atascadero Creek at GVR

Atascadero Creek at GVR

SiteID: RBATA001

Lat: 38.44431

Long: -122.877

Site Characterization

Field Observations

This site is adjacent to a large floodplain or wetland area. Sample site is on south-east side of bridge.

Vegetation

This site is dominated by willows (Salix sp.) that are about 8m tall and have a DBH between 6-11”. Tree species, including alder (Alnus sp.), walnut (Juglans sp.) and oak (Quercus garryana), are scattered throughout the landscape. Other tree species, unidentifiable at the time of sampling, grow at this site as well. The understory is dominated by Himalayan blackberry (Rubus discolor) and a variety of other non-native species, including periwinkle (Vinca major). Total Cover: 60%


Copeland Creek

Copeland Creek

SiteID: RBCOP001

Lat: 38.34312

Long: -122.71196

Site Characterization

Field Observations

The Copeland Creek sampling location is the most southern sampling point for the 2009 sampling season. The samples are collected immediately upstream from the Commerce Blvd Bridge at the City of Rohnert Park Building just south of a group of strip malls.

Vegetation

This site is dominated by non-native privet (Ligustrum sp.) in the over story that are less than 5 meters tall and are between 1-6" in DBH. California bay (Umbellularia californica) is also common in the over story. Himalayan blackberry (Rubus discolor) is the dominant species in the understory and has about 10% cover. There are a few non-native, possibly planted species at this site, including Cotoneaster sp. Other deciduous tree or shrub species may be present but were unidentifiable at the time of sampling. Evidence of last season's horsetail (Equisetum sp. (telmateia?) and Harding grass (Phalaris aquatica) were present in low densities. Total Cover: 25%

 


Foss Creek

Foss Creek

SiteID: RBFOS001      

Lat: 38.61111                                                                                                                                                                          

Long: -122.87188

Site Characterization

Field Observations

The Foss Creek site is the most northern sampling location and is located in downtown Healdsburg, just 30 ft up from the pedestrian bridge by the plaza parking lot.

Vegetation

The Foss Creek site is heavily disturbed with mowed grass extending up to the west bank of the creek. There are planted non-native bulbs and weedy herbaceous species (mint (Mentha spicata), Cyperus eragrostis, etc.) along the creek edge. There are scattered box elder (Acer sp.) and willows (Salix sp.), which are about 8.5m tall and have a DBH between 1-6”. These tree species may have been planted or are the only trees remaining due to high disturbance. Himalayan blackberry (Rubus discolor) is dense on the east bank, but is absent and likely managed for, on the grassy west bank. North of the sample site the vegetation is more intact and has a higher cover of willow species. Total Cover: 30%


Laguna de Santa Rosa

SiteID: RBLAG005

Lat: 38.4079266667

Long: -122.818068889

 

Site Characterization

Field Observations

Vegetation Description

There are many different over story tree species at this site, including walnut (Juglans sp.), two species of oak (Quercus agrifolia and Quercus garryana), box elder (Acer sp.), and willows (Salix sp.) ranging from 5m to 15m tall. Tree cover comprises about 15% of the total cover for this site. In the shrub layer, Himalayan blackberry (Rubus discolor) is dominant and makes up 45% of the total cover. The herbaceous layer contained very few species, due to the early nature of the sampling event. Total Cover: 60%

 


Laguna de Santa Rosa downstream of Confluence

Site ID: 114LAGU02
Lat: 38.4515976114
Long: -122.834531249

Site Characterization

Field Observations:

Vegetation Description:

This site contains a few scattered willows (Salix sp.), box elders (Acer sp.) and other tree species (will return in spring/summer for positive identification) that range in height from 9.44m to 16.07m and range in dbh from around 10" - 20". The understory is dominated by Himalayan blackberry (Rubus discolor). The path or road leading up to the sampling site is dominated by other non-native forbs and grasses, including bristly ox tounge (Picris echioides) and Bermuda grass (Cynodon dactylon).

Total Cover: 65%


Lower Dry Creek

Lower Dry Creek

SiteID: UCDRRPP002

Latitude: 38.6045740781

Longitude: -122.882534731

Lower Dry Creek is a new sampling site, and is located less than a mile south-west of the Foss Creek Sampling Site.

Site Characterization

Field Observations

Vegetation

This over story at this site is dominated by mature alder’s (Alnus sp.) and walnut’s (Juglans sp.) that are between 14-16m tall with DBH’s between 11-24”. This site has a mid-level tree/shrub layer that includes willows (Salix sp.; 5-10m tall) and elderberry’s (Sambucus sp.; 3m tall). Beneath these two tree strata, the dense understory is dominated by non-natives including the highly invasive periwinkle (Vinca major) and Himalayan blackberry (Rubus discolor). Total Cover: 45%


Lower Green Valley Creek

Lower Green Valley Creek

SiteID: CCGVC00

Lat: 38.502361335

Long: -122.908540634

Site Characterization

Field Observations

Vegetation

The Lower Green Valley Creek site is dominated by coast redwood (Sequoia sempervirens) and California bay (Umbellularia californica) in the highest and middle strata. This site is considered multi-layered, with smaller mature trees growing under the canopy of larger trees (in this case coast redwood). The understory in dominated by Himalayan blackberry (Rubus discolor; 30% cover), some grape (Vitus californica) climbing the bay trees, and a small amount of periwinkle (Vinca major).

Total Cover: 55%


Mill Creek

SiteID: CCMIL001

Latitude: 38.5965139

Longitude: -122.909694618 S

Site Characterization

Field Observations

Vegetation

This site is dominated by coast redwood (Sequoia sempervirens; 36m tall) in the highest strata and California bay (Umbellularia californica; 10-15m tall) and Cotoneaster sp. (7m tall) in the lower tree strata. The understory includes sword fern (Polystichum sp.), periwinkle (Vinca major), both native blackberry (Rubus ursinus) and Himalayan blackberry (Rubus discolor), Carex barbarae, and ivy (non-native). Total Cover: 50%


Prince Memorial Greenway

Prince Memorial Greenway

SiteID: RBSRC004

Lat: 38.43481388

Long: -122.7196833

Site Characterization

Field Observations

Vegetation This site is dominated by young, possibly planted alders (Alnus sp.) and willows (Salix sp.) that are between 5m to 10m tall and have a dbh between 1-6”. The site is restricted by a cement walkway and appears to be actively managed both through plantings and invasive species control. Total Cover: 35%


Upper Mark West

Upper Mark West

SiteID: CCMWC004

Lat: 38.5070844895

Long: -122.646152544

Upper Mark West is located on St. Helena Rd; 1/4 mile up from Calistoga Rd. The sample is taken upstream of the vehicular bridge.

Site Characterization

Field Observations

Vegetation

The overstory of this site includes two species of oaks (Quercus garryana (15% cover) and Quercus agrifolia (5% cover)), California bay (Umbellularia californica), madrone (Arbutus menziesii), and non-native privet (Ligustrum sp.). The tree species range from 4.2m tall near the bank to 12.76m tall. The understory is very diverse (compared to the other sites in this study) and includes California wild rose (Rosa californica), goldenback fern (Pentagramma triangularis), Lonicera sp., periwinkle (Vinca major), and a few other native and non-native species. Total Cover: 45%


Upper Santa Rosa Creek

Upper Santa Rosa
SiteID: UCDRRPP001
Lat: 38.466719604
Long: -122.621655996

Site Characterization

Field Observations

Vegetation

This site contains a large amount of alder (Alnus sp.; 13.69m tall to 18.9m tall) and oak (Quercus garryana) in the tallest strata and willow (Salix sp.; 2.22m tall) in the secondary strata. There is one giant California bay (Umbellularia californica) at this site that is about 23m tall and has a dbh that is greater than 24 inches. The understory is a mix of Himalayan blackberry (Rubus discolor), horsetail (Equsetum sp., last season), Polypodium sp., etc. There is a small patch of Arundo donax at this site.

Total Cover: 45%