Devereux Slough


GENERAL

Source
SiteDevereux Slough

MapGoleta & Dos Pueblos Canyon, USGS 7.5' quadrangles

LocationDevereux Slough is located on the West Campus of the University of California at Santa Barbara, 0.5 miles west of the community of Isla Vista and approximately 10 miles west of downtown


Santa Barbara. Most of the slough is part of the Coal Oil Point Natural Reserve, administered by UC Santa Barbara.

ContactsCoal Oil Point Reserve: 805-893-4127


UC Natural Reserve System - UC Santa Barbara: 805-893-2401


Devereux (School) Santa Barbara: 805-968-2525

Approximate Wetland Habitat Acreage 70 (area south of El Collegio Road including the north and south fingers of Devereux Slough)
1
Approximate Historic Acreage Acreage not available, it is estimated to have been approximately 2 to 3 times its present size.
1
OwnershipOwner
Acres
Source

University of California Natural Reserve System (UCNRS)(acreage is for the entire Coal Oil Point Reserve) 117
6

Devereux (School) Santa Barbara Not Specified
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LAND USE

Source
Land Use Designation UC Santa Barbara 1990 Long Range Development Plan designates the Coal Oil Point Natural Reserve as an Environmentally Sensitive Habitat Area and along the northern edge of Devereux Slough as Open Space.
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Onsite UseAs a part of the UCNRS the area is reserved for habitat and wildlife preservation, public education, and academic research.
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Historic UseNative Americans lived in the area of Devereux Slough for approximately 6000 years. Beginning with Spanish settlement in 1786, the mesa surrounding the slough was used for agriculture. The construction of the Campbell estate, beginning in 1919, required construction of several access roads and berms in the slough. Large scale alteration of Upper Devereux Slough occurred in the mid 1960's with the construction of a golf course in the slough along Devereux Creek and filling of the slough for residential development. The University purchased Coal Oil Point in 1967 and established the reserve in 1970 (expanded in 1979 to include most of Devereux Slough).
1
Adjacent UseThe slough is bounded to the east by the Devereux Santa Barbara (a private school) and UCSB West Campus, to the west by Mobil oil tanks and residential development, to the north by the Ocean Meadows Golf Course and UCSB North Campus, and to the south by the Pacific Ocean.
2
Adjacent Historic Use By the early 1920's much of the mesa surrounding the slough was in agricultural uses. Residential development to the east of the slough and in the community of Isla Vista continued to increase from the 1920's on. Oil and gas storage facilities were constructed in the late 1920's on the mesa to the west. By the 1980's most of the watershed had been urbanized.
1
HYDROLOGY

Source
Tidal Influence The slough is tidally influenced only during short periods in the winter. A beach berm forms at the mouth of the slough during drier months. The beach berm may be over-topped by ocean waves during seasonally high tides and storms. The North and South Fingers are connected to the main slough by culverts, but only the lower portions of these areas are flooded during the highest tides.
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Watershed Area 2330 acres
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Tributaries and Flow Tributary
Flow
Source

Devereux Creek Winter flows in the creek are dependent on storm events and in drier months the intermittent flow is from agricultural and landscape run-off. Calculated average annual run-off, using records for the period 1941-1988, is approximately 690 acre-feet.
3
DamsNone specified.

Other Sources Overland flow from the surrounding mesa, and small channels and ditches from the north and northeast.
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WATER QUALITY

Source
GeneralThe RWQCB does not identify beneficial uses for the slough nor is it listed on the 303(d) List. Beneficial Uses for Devereux Creek are identified as mun, gwr, rec1, rec2, wild, warm fresh, and comm. The creek is not identified on the 303(d) List.
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Dissolved Oxygen (DO) 1987 - 1989 weekly to monthly sampling in the early morning and afternoon at seven stations. DO in morning bottom waters ranged from below detectable limits (temp. 8-10 C) to 8 ppm (temp. 20 C). Concentrations of less than 2 ppt were recorded in the bottom water during early Winter and Spring 1987/88 with an average water temperature of 15 degrees C and in the Winter of 1989 with an average water temperature of 18 degrees C.
3
Water Salinity 1984 - 1986 sampling of surface water from five sites in the permanently flooded portions of the slough. Salinity is highly variable due to freshwater inputs from storm events, breaching of the beach barrier, and hypersaline conditions from evaporation. The water column is stratified except during periods when the beach berm is breached. Over the 4 year period salinities ranged from 0 to 80 ppt at the head of the slough, 0 to 85 ppt in the middle of the slough, and 0 to 59 ppt at the mouth.
2
SedimentSediment input from Devereux Creek is limited as most of it is deposited on the golf course or behind a weir located at the mouth of the creek. The primary source of sediment is from the property located directly north of the slough. Sediment loading from this property was calculated at 21,062 cu. ft./year for the years 1965 through 1988.
3
SOIL

Source
SoilSoils in the slough include sand, silt, and clay layers to a depth of 45 feet over late Pleistocene canyons. Core samples at several locations in the slough contain marine shells at about 4 feet below the present slough surface indicating that the slough may have been a marine embayment until fairly recently.
2
HabitatAcres Vegetation
Seasonally flooded (channels, mud and saltflats) 15.6Non-vegetated.
2
Vegetated aquatic bed (open water)23.4 1987 - dominated by ditch grass.
2
Estuarine emergent wetland (saltmarsh)18.3 1987 - primarily pickleweed, also includes cattails, bulrush, salt bush, and salt grass.
2
Scrub/shrub wetland0.2 1987 - dominated by coyote bush.
2
Emergent palustrine wetland (brackish water marsh) 71987 - dominated by western ragweed and nut grass.
2
Palustrine (scrub/shrub and forested wetland) 81987 - dominated by willows, coyote bush and golden wattle*; includes the dune swale area which primarily supports salt marsh vegetation.
10
ANIMAL USE

Source
Birds1986-94 cumulative list of sightings - 290 species have been documented at the slough and Coal Oil Point Reserve of which 118 are water associated including 15 species of special status; the white-faced ibis# was recorded as nesting.
10
FishSurveys in May and October 1993 using seines and traps identified a total of 5 species; topsmelt, killifish, longjaw mudsucker, diamond turbot, and staghorn sculpin.
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Benthic Invertebrates Not specified.
Insect1993 - aquatic sampling in November identified four species; brine flies, mosquitoes, water treader, and saltmarsh water boatmen.
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Other Wildlife 1986/87 - surveys in September and January using trapping, scent stations and visual signs around the fringe of the slough yielded four species of rodents. Primary mammal predators have been identifed as bobcat, badger, red fox and raccoon (1997).
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Special Status Species 1986-1994 - common loon, American white pelican, brown pelican, double-crested cormorant, white-faced ibis#, osprey, bald eagle, northern harrier, peregrine falcon, snowy plover, California gull, elegant tern, black tern, Belding's Savannah sparrow, and tricolored blackbird.
2
OUTLOOK

Source
Enhancement Status In 1995 a 'Natural Areas Plan' was completed which identifies management opportunities for improving the environment and protecting the natural resources of Devereux Slough. Certification of the University's Long Range Development Plan required the adoption of the management guidelines established in the Plan. A Management Plan for the Coal Oil Point Natural Reserve is being developed (Winter/Spring 1997) which elaborates on specific programs required for the maintenance, development and enhancement of the reserve. In the fall of 1996, as a part of compensatory mitigation project, the Devereux Santa Barbara began the restoration and enhancement of the South Finger. The project includes removing of fill and recontouring the site, increasing tidal action, controlling erosion, removing exotic plants, and planting with native species.
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Watershed Management None specified.

PressureSediment loading is reducing the total size of the slough. Continued residential development in the watershed may increase contamination of runoff entering the slough. Exotic plant species are displacing native plants and altering the habitats.
1
SOURCES


1Ferren, Wayne R. Jr., and Kathryn A. Thomas. 1995. University of California, Santa Barbara natural areas plan: classification, inventory, and management guidelines. UCSB Museum of Systematics and Ecology Environmental Report No. 12. 381 pp. This plan assesses the physical, biological and cultural resources of the natural areas in 3 of the 4 campuses at U. C. Santa Barbara and identifies management opportunities and implementation guidelines for protection of these natural resources. The current and historic environmental setting are described along with a history of land use and habitat types, which includes aerial photographs and maps. The description of existing conditions uses a detailed classification of vegetative associations based on 1:200 aerial photos and ground-truthing. It also incorporates data from previous studies to describe the terrain, soils, hydrology, historic alterations to the landscape and botanical and zoological attributes of 16 sites. Functional values and impacts of past and ongoing uses are evaluated, and specific management and enhancement actions are recommended for each of these areas. Appendices include a bibliography of documents relating to the landscape of UCSB, and a catalogue of area plants.

2Ferren Jr., W. R., D. G. Capralis & D. Hickson. 1987. University of California Santa Barbara campus wetlands managment plan: Part 1 - technical report on the botanical resources of West and Storke Campus. The Herbarium, Environmental Report No. 12. 196 pp., including appendix. The purpose of this study was to determine the nature and extent of the historical wetlands at the West and Storke Campuses, evaluate the botanical resources, and to suggest management opportunities for the wetlands. The study contains a review of the physical environment and history of the wetlands. The botanical survey included vegetation classification and mapping, percent cover, a quantitative analysis of the vegetation and a detailed description of the flora. The appendices include the classification of vegetated wetlands and an annotated and illustrated catalogue of the vascular plants at the campus.

3Davis, F.W., D. Theobald, R. Harrington & A. Parikh. 1990. University of California Santa Barbara Campus Wetlands Management Plan; Part 2 - technical report hydrology, water quality and sedimentation of West and Storke Campus Wetlands. Department of Geology, UCSB. 105 pp. This document summarizes studies of hydrology, water quality and sedimentation in the Devereux Slough and Storke Campus wetlands. The information was developed for evaluating the feasibility and desirability of restoration and enhancement goals proposed in 1986. Additionally, the study was designed to provide baseline data to evaluate the success of future restoration and enhancement activities. The report contains original monitoring data on surface and groundwater quality, bathymetry, sedimentation and the beach berm topography at Devereux Slough.

4Holmgren M., L. Hunt, & E. Schultz. 1987. University of California, Santa Barbara campus wetlands managment plan; Part 3 - draft report of the vertebrate resources of West and Storke Campus. UCSB Vertebrate Museum, Environmental Report No. 1. ~57 pp. plus appendices. The report contains the results of a one-year inventory of mammals, fish, amphibians, reptiles and an assessment of their relationship to the wetlands and adjacent habitats. Species inventories and historical information are compiled as a basis for determining enhancement requirements for the wetlands. Included in the report is a detailed description of sampling methods and original survey data for mammals, amphibians and reptiles, and fish.

5Sedway Cooke Associates and Richard Morehouse Associates. 1990. University of California, Santa Barbara 1990 Long Range Development Plan. Prepared for the University of California, Santa Barbara, Office of Budget and Planning. 222 pp. The plan was developed to guide physical development on the Campus through academic year 2005/06, in fulfillment of both University policy and certain provisions of the California Coastal Act. It sets forth the Campus' land use and development proposals for buildings, roads, parking areas, open space, and natural resource preservation on Main, Storke and West campuses. The plan is an amendment of the Long Range Development Plan approved in 1980. Descriptions of natural resources are general and made within the context of the earlier plan and associated FEIR.

6Herring, M.L., University of California Natural Reserve System, ed. 1990. Coal Oil Point Natural Reserve. 10 pp. Public information pamphlet on the Coal Oil Point Natural Reserve. Provides an overview of the reserve, its history, research facilities, hydrology and geology, and a description of habitat areas. A brief review of the flora and fauna is also provided

7California Regional Water Quality Control Board, Central Region. 1994. Water quality control plan, Central Coast Region. 200 pp., plus appendices. The plan designates beneficial uses and associated water quality objectives for inland surface waters, enclosed bays and estuaries, and ground waters, for the Central Coast (Santa Barbara, San Luis Obispo, Monterey, San Benito, Santa Cruz and portions of San Mateo, Kern and Ventura Counties). It includes a discussion of applicable policies and statutory requirements and identifies measures for achieving water quality objectives. It also describes ongoing monitoring and assessment programs. Appendices contain 35 documents, including the text of state and local policies relevant to implementation of the plan, descriptions of ground water basins and sub-areas, and analyses used to develop various discharge and disposal requirements.

8Central Coast Regional Water Quality Control Board. 1996. 303(d) list of impaired water bodies. 6 pp. A list of waterbodies in the Central Coast Region that do not or are not expected to attain water quality standards after application of required technology-based controls. The list includes the size of the water body, the sampled pollutants affecting designated beneficial uses, the source of the pollutant, and the water body's priority status with regard to developing Total Maximum Daily Loads (TMDLs). The TMDL is the total amount of a pollutant that can be discharged into a water body without compromising water quality standards. 303(d) lists are prepared as part of the Water Quality Assessment of the State's major waterbodies, and meet a requirement of section 303(d) of the federal Clean Water Act

9Ambrose, R .F. (ed), J. A. Altsatt, K. D. Lafferty, & C. P. Sandoval. 1995. Coastal wetland resources of the Santa Barbara County mainland. Environmental Science and Engineering Program, UCLA. 89 pp. Report briefly describes the physical features and biological community at 10 wetland sites (Santa Maria River, San Antonio Creek, Santa Ynez River, Canada Honda Creek, Canada de Santa Anita, Canada de Alegria, Gaviota Creek, Devereux Slough, Goleta Slough, and Arroyo Burro) in Santa Barbara County to obtain baseline information on these resources. Plants, invertebrates, fishes and birds were surveyed at the 10 sites, and the original survey data are contained within the report. An additional 12 sites were surveyed for the presence of tidewater gobies.

10Holmgren, M.; UCSB Museum of Systematics and Ecology. February 1997. Personal communication, unpublished field surveys of birds at Coal Oil Point Reserve.

11Science Applications International Corporation for the Devereux Foundation. 1996. Devereux Slough, South Finger restoration (draft). 10 pp. This restoration plan covers site preparation, planting materials, operation, maintenance, and the monitoring program. The plan calls for the removal of fill and debris, grading and recontouring to increase tidal circulation, and restoration of native vegetation at the 1.5 acre site. A plant species list for each habitat zone is provided in the appendix.

12Lafferty, K. D.; UC Santa Barbara, Marine Science Institute. April 1997. Personal copmmunication.


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