Note: Dotted lines in the time series indicate a data gap of more than 1 month between observations.
Note: Log-transform is applied to the y-axis. Only values greater than 0 are shown; zeros and negatives are excluded from the plot.
Coal Oil Point Reserve — Devereux Slough Water Quality Monitoring
An interactive dashboard to explore long-term monitoring data and seasonal patterns across multiple sites and depths.
What you can do
- Analyze parameters with units: Temperature (C), Salinity (ppt), Dissolved Oxygen (mg/L, %), Conductivity-specific (mS/cm).
- Filter by site, depth layer (or fixed pier depth), years, and months.
- Switch the map between Street and Satellite views; inspect popups for coordinates.
At a glance
Sites: Mouth (MO1)
Culvert (CUL1)
Bridge (VBR1)
Pier (PIER)
Surface & Bottom (non-PIER)
Fixed depths at PIER
How to use this app
- Trends → Time Series: select a parameter to view changes through time at a site and depth.
- Trends → Seasonal Patterns: compare monthly distributions across years.
- Map: locate monitoring sites and toggle basemaps.
Data Notes
Dataset covers January 2017 to October 2025 (4091 observations across 4 sites).
Last updated: October 31, 2025
Download Citation
COPR interns have conducted weekly sampling to monitor key water-quality indicators. Updated monthly, this app allows users to toggle between years and months to visualize seasonal and long-term trends in the slough’s dynamic ecosystem.
If you would like to support ongoing monitoring and student research at the reserve, please consider visiting our Give page.
DonateMonitoring Site Locations
Methods & Frequently Asked Questions
Sampling Design
Sites include Mouth (MO1), Culvert(CUL1), Bridge (VBR1), and Pier (PIER) within the Devereux Slough system. Non-pier sites are summarized by Surface (≤20 cm) and Bottom (>20 cm) depth layers. PIER measurements use fixed depths (e.g., 10–250 cm).
Parameters & Units
- Temperature (C) — water temperature in degrees Celsius.
- Dissolved Oxygen (mg/L) — concentration by mass.
- Dissolved Oxygen (%) — percent saturation.
- Salinity (ppt) — practical salinity in parts per thousand.
- Conductivity-specific (mS/cm) — temperature-corrected conductivity.
Seasonality vs. Interannual trends
Use the Time Series view to explore long-term changes at a site/depth, and Seasonal Patterns to compare distributions by month across years.
Depth & Water Level
Measurements are taken with a handheld YSI Pro2030 at fixed sites along the slough. Water depth changes seasonally, so during dry periods, some sites may be too shallow to sample. When the slough is low or dry, readings may reflect air conditions rather than water conditions.
Data Quality & Caveats
Values are plotted as provided after basic type-cleaning. Consider calibration records, instrument changes, and field conditions when interpreting extremes.
Filters (years/months) apply to both plots and may change distributions.
Contact & Attribution
Developed for the Coal Oil Point Reserve (UCSB). For questions or to report issues, please contact the COPR team via email .
Developed by Samuel A. Cervantes and Michelle Moreno