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SAN JOAQUIN RIVER DELTA - ROUGH & READY ISLAND (RRIC1)
| Latitude: 37.96º N | Longitude: 121.36º W | Elevation: 15 Feet | | Forecast Type: Unofficial Location |
| Location: San Joaquin County in California | Bulletin Group: San Joaquin | River Group: San Joaquin |
| Issuance Time: | May 15 2026 at 7:53 AM PDT | Next Issuance: | May 16 2026 at 9:00 AM PDT
| |
| Action/Monitor: N/A | Minor Flood: N/A | Moderate Flood: N/A | Major Flood: N/A |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River Delta - Rough and Ready Island (RRIC1)
#
# File Generation Time: 05/15/2026 at 07:56 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 05/15/2026 at 05:00 AM PDT
# Maximum Observed Stage: 6.64 Feet
#
# Earliest Date & Time of Maximum Forecast: 05/19/2026 at 05:00 PM PDT
# Maximum Forecast Stage: 1830.88 Feet
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Trend Observed Status
# ------------------------------------------------------------------
05/10/2026 07 AM PDT 4.25 Not Applicable
05/10/2026 08 AM PDT 4.20 - Not Applicable
05/10/2026 09 AM PDT 4.46 + Not Applicable
05/10/2026 10 AM PDT 4.93 + Not Applicable
05/10/2026 11 AM PDT 5.26 + Not Applicable
05/10/2026 12 PM PDT 5.31 + Not Applicable
05/10/2026 01 PM PDT 5.14 - Not Applicable
05/10/2026 02 PM PDT 4.64 - Not Applicable
05/10/2026 03 PM PDT 4.13 - Not Applicable
05/10/2026 04 PM PDT 3.72 - Not Applicable
05/10/2026 05 PM PDT 3.29 - Not Applicable
05/10/2026 06 PM PDT 2.90 - Not Applicable
05/10/2026 07 PM PDT 2.55 - Not Applicable
05/10/2026 08 PM PDT 2.36 - Not Applicable
05/10/2026 09 PM PDT 2.65 + Not Applicable
05/10/2026 10 PM PDT 3.52 + Not Applicable
05/10/2026 11 PM PDT 4.19 + Not Applicable
05/11/2026 12 AM PDT 4.65 + Not Applicable
05/11/2026 01 AM PDT 5.11 + Not Applicable
05/11/2026 02 AM PDT 5.50 + Not Applicable
05/11/2026 03 AM PDT 5.67 + Not Applicable
05/11/2026 04 AM PDT 5.48 - Not Applicable
05/11/2026 05 AM PDT 4.90 - Not Applicable
05/11/2026 06 AM PDT 4.38 - Not Applicable
05/11/2026 07 AM PDT 4.09 - Not Applicable
05/11/2026 08 AM PDT 3.85 - Not Applicable
05/11/2026 09 AM PDT 3.73 - Not Applicable
05/11/2026 10 AM PDT 4.03 + Not Applicable
05/11/2026 11 AM PDT 4.66 + Not Applicable
05/11/2026 12 PM PDT 5.11 + Not Applicable
05/11/2026 01 PM PDT 5.27 + Not Applicable
05/11/2026 02 PM PDT 5.23 - Not Applicable
05/11/2026 03 PM PDT 4.82 - Not Applicable
05/11/2026 04 PM PDT 4.18 - Not Applicable
05/11/2026 05 PM PDT 3.75 - Not Applicable
05/11/2026 06 PM PDT 3.37 - Not Applicable
05/11/2026 07 PM PDT 2.95 - Not Applicable
05/11/2026 08 PM PDT 2.61 - Not Applicable
05/11/2026 09 PM PDT 2.49 - Not Applicable
05/11/2026 10 PM PDT 3.13 + Not Applicable
05/11/2026 11 PM PDT 4.09 + Not Applicable
05/12/2026 12 AM PDT 4.67 + Not Applicable
05/12/2026 01 AM PDT 5.13 + Not Applicable
05/12/2026 02 AM PDT 5.59 + Not Applicable
05/12/2026 03 AM PDT 5.91 + Not Applicable
05/12/2026 04 AM PDT 5.94 + Not Applicable
05/12/2026 05 AM PDT 5.46 - Not Applicable
05/12/2026 06 AM PDT 4.90 - Not Applicable
05/12/2026 07 AM PDT 4.29 - Not Applicable
05/12/2026 08 AM PDT 3.96 - Not Applicable
05/12/2026 09 AM PDT 3.61 - Not Applicable
05/12/2026 10 AM PDT 3.47 - Not Applicable
05/12/2026 11 AM PDT 3.89 + Not Applicable
05/12/2026 12 PM PDT 4.69 + Not Applicable
05/12/2026 01 PM PDT 5.22 + Not Applicable
05/12/2026 02 PM PDT 5.49 + Not Applicable
05/12/2026 03 PM PDT 5.60 + Not Applicable
05/12/2026 04 PM PDT 5.38 - Not Applicable
05/12/2026 05 PM PDT 4.75 - Not Applicable
05/12/2026 06 PM PDT 4.21 - Not Applicable
05/12/2026 07 PM PDT 3.83 - Not Applicable
05/12/2026 08 PM PDT 3.40 - Not Applicable
05/12/2026 09 PM PDT 3.07 - Not Applicable
05/12/2026 10 PM PDT 3.13 + Not Applicable
05/12/2026 11 PM PDT 4.00 + Not Applicable
05/13/2026 12 AM PDT 4.87 + Not Applicable
05/13/2026 01 AM PDT 5.33 + Not Applicable
05/13/2026 02 AM PDT 5.75 + Not Applicable
05/13/2026 03 AM PDT 6.10 + Not Applicable
05/13/2026 04 AM PDT 6.22 + Not Applicable
05/13/2026 05 AM PDT 5.82 - Not Applicable
05/13/2026 06 AM PDT 5.04 - Not Applicable
05/13/2026 07 AM PDT 4.50 - Not Applicable
05/13/2026 08 AM PDT 4.12 - Not Applicable
05/13/2026 09 AM PDT 3.71 - Not Applicable
05/13/2026 10 AM PDT 3.34 - Not Applicable
05/13/2026 11 AM PDT 3.16 - Not Applicable
05/13/2026 12 PM PDT 3.70 + Not Applicable
05/13/2026 01 PM PDT 4.57 + Not Applicable
05/13/2026 02 PM PDT 5.08 + Not Applicable
05/13/2026 03 PM PDT 5.33 + Not Applicable
05/13/2026 04 PM PDT 5.48 + Not Applicable
05/13/2026 05 PM PDT 5.32 - Not Applicable
05/13/2026 06 PM PDT 4.71 - Not Applicable
05/13/2026 07 PM PDT 4.09 - Not Applicable
05/13/2026 08 PM PDT 3.71 - Not Applicable
05/13/2026 09 PM PDT 3.35 - Not Applicable
05/13/2026 10 PM PDT 3.09 - Not Applicable
05/13/2026 11 PM PDT 3.40 + Not Applicable
05/14/2026 12 AM PDT 4.39 + Not Applicable
05/14/2026 01 AM PDT 5.12 + Not Applicable
05/14/2026 02 AM PDT 5.58 + Not Applicable
05/14/2026 03 AM PDT 5.98 + Not Applicable
05/14/2026 04 AM PDT 6.24 + Not Applicable
05/14/2026 05 AM PDT 6.11 - Not Applicable
05/14/2026 06 AM PDT 5.37 - Not Applicable
05/14/2026 07 AM PDT 4.63 - Not Applicable
05/14/2026 08 AM PDT 4.22 - Not Applicable
05/14/2026 09 AM PDT 3.78 - Not Applicable
05/14/2026 10 AM PDT 3.28 - Not Applicable
05/14/2026 11 AM PDT 2.85 - Not Applicable
05/14/2026 12 PM PDT 2.66 - Not Applicable
05/14/2026 01 PM PDT 3.26 + Not Applicable
05/14/2026 02 PM PDT 4.28 + Not Applicable
05/14/2026 03 PM PDT 4.84 + Not Applicable
05/14/2026 04 PM PDT 5.16 + Not Applicable
05/14/2026 05 PM PDT 5.38 + Not Applicable
05/14/2026 06 PM PDT 5.36 - Not Applicable
05/14/2026 07 PM PDT 4.84 - Not Applicable
05/14/2026 08 PM PDT 4.12 - Not Applicable
05/14/2026 09 PM PDT 3.71 - Not Applicable
05/14/2026 10 PM PDT 3.46 - Not Applicable
05/14/2026 11 PM PDT 3.45 - Not Applicable
05/15/2026 12 AM PDT 4.24 + Not Applicable
05/15/2026 01 AM PDT 5.13 + Not Applicable
05/15/2026 02 AM PDT 5.65 + Not Applicable
05/15/2026 03 AM PDT 6.08 + Not Applicable
05/15/2026 04 AM PDT 6.49 + Not Applicable
05/15/2026 05 AM PDT 6.64 + Not Applicable
05/15/2026 06 AM PDT 6.12 - Not Applicable
05/15/2026 07 AM PDT 5.36 - Not Applicable
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Trend Forecast Status
# ------------------------------------------------------------------
05/15/2026 08 AM PDT 4.50 Not Applicable
05/15/2026 09 AM PDT 3.64 - Not Applicable
05/15/2026 10 AM PDT 2.83 - Not Applicable
05/15/2026 11 AM PDT 2.24 - Not Applicable
05/15/2026 12 PM PDT 2.00 - Not Applicable
05/15/2026 01 PM PDT 2.20 + Not Applicable
05/15/2026 02 PM PDT 2.81 + Not Applicable
05/15/2026 03 PM PDT 3.69 + Not Applicable
05/15/2026 04 PM PDT 4.46 + Not Applicable
05/15/2026 05 PM PDT 4.97 + Not Applicable
05/15/2026 06 PM PDT 5.15 + Not Applicable
05/15/2026 07 PM PDT 5.03 - Not Applicable
05/15/2026 08 PM PDT 4.70 - Not Applicable
05/15/2026 09 PM PDT 4.28 - Not Applicable
05/15/2026 10 PM PDT 3.97 - Not Applicable
05/15/2026 11 PM PDT 3.88 - Not Applicable
05/16/2026 12 AM PDT 4.16 + Not Applicable
05/16/2026 01 AM PDT 4.81 + Not Applicable
05/16/2026 02 AM PDT 5.58 + Not Applicable
05/16/2026 03 AM PDT 6.36 + Not Applicable
05/16/2026 04 AM PDT 6.92 + Not Applicable
05/16/2026 05 AM PDT 7.12 + Not Applicable
05/16/2026 06 AM PDT 6.91 - Not Applicable
05/16/2026 07 AM PDT 6.34 - Not Applicable
05/16/2026 08 AM PDT 5.49 - Not Applicable
05/16/2026 09 AM PDT 4.56 - Not Applicable
05/16/2026 10 AM PDT 3.62 - Not Applicable
05/16/2026 11 AM PDT 2.73 - Not Applicable
05/16/2026 12 PM PDT 2.12 - Not Applicable
05/16/2026 01 PM PDT 1.88 - Not Applicable
05/16/2026 02 PM PDT 2.14 + Not Applicable
05/16/2026 03 PM PDT 2.77 + Not Applicable
05/16/2026 04 PM PDT 3.71 + Not Applicable
05/16/2026 05 PM PDT 4.52 + Not Applicable
05/16/2026 06 PM PDT 5.05 + Not Applicable
05/16/2026 07 PM PDT 5.26 + Not Applicable
05/16/2026 08 PM PDT 5.16 - Not Applicable
05/16/2026 09 PM PDT 4.88 - Not Applicable
05/16/2026 10 PM PDT 4.52 - Not Applicable
05/16/2026 11 PM PDT 4.23 - Not Applicable
05/17/2026 12 AM PDT 4.17 - Not Applicable
05/17/2026 01 AM PDT 4.48 + Not Applicable
05/17/2026 02 AM PDT 5.09 + Not Applicable
05/17/2026 03 AM PDT 5.89 + Not Applicable
05/17/2026 04 AM PDT 6.67 + Not Applicable
05/17/2026 05 AM PDT 7.23 + Not Applicable
05/17/2026 06 AM PDT 7.42 + Not Applicable
05/17/2026 07 AM PDT 7.19 - Not Applicable
05/17/2026 08 AM PDT 6.56 - Not Applicable
05/17/2026 09 AM PDT 5.63 - Not Applicable
05/17/2026 10 AM PDT 4.63 - Not Applicable
05/17/2026 11 AM PDT 3.60 - Not Applicable
05/17/2026 12 PM PDT 2.63 - Not Applicable
05/17/2026 01 PM PDT 1.94 - Not Applicable
05/17/2026 02 PM PDT 1.68 - Not Applicable
05/17/2026 03 PM PDT 2.01 + Not Applicable
05/17/2026 04 PM PDT 2.70 + Not Applicable
05/17/2026 05 PM PDT 3.69 + Not Applicable
05/17/2026 06 PM PDT 4.56 + Not Applicable
05/17/2026 07 PM PDT 5.12 + Not Applicable
05/17/2026 08 PM PDT 0.00 - Not Applicable
05/17/2026 09 PM PDT 0.00 0 Not Applicable
05/17/2026 10 PM PDT 0.00 0 Not Applicable
05/17/2026 11 PM PDT 0.00 0 Not Applicable
05/18/2026 12 AM PDT 0.00 0 Not Applicable
05/18/2026 01 AM PDT 0.00 0 Not Applicable
05/18/2026 02 AM PDT 0.00 0 Not Applicable
05/18/2026 03 AM PDT 0.00 0 Not Applicable
05/18/2026 04 AM PDT 0.00 0 Not Applicable
05/18/2026 05 AM PDT 0.00 0 Not Applicable
05/18/2026 06 AM PDT 0.00 0 Not Applicable
05/18/2026 07 AM PDT 0.00 0 Not Applicable
05/18/2026 08 AM PDT 0.00 0 Not Applicable
05/18/2026 09 AM PDT 0.00 0 Not Applicable
05/18/2026 10 AM PDT 0.00 0 Not Applicable
05/18/2026 11 AM PDT 0.00 0 Not Applicable
05/18/2026 12 PM PDT 0.00 0 Not Applicable
05/18/2026 01 PM PDT 0.00 0 Not Applicable
05/18/2026 02 PM PDT 0.00 0 Not Applicable
05/18/2026 03 PM PDT 0.00 0 Not Applicable
05/18/2026 04 PM PDT 0.00 0 Not Applicable
05/18/2026 05 PM PDT 0.00 0 Not Applicable
05/18/2026 06 PM PDT 0.00 0 Not Applicable
05/18/2026 07 PM PDT 0.00 0 Not Applicable
05/18/2026 08 PM PDT 0.00 0 Not Applicable
05/18/2026 09 PM PDT 0.00 0 Not Applicable
05/18/2026 10 PM PDT 0.00 0 Not Applicable
05/18/2026 11 PM PDT 0.00 0 Not Applicable
05/19/2026 12 AM PDT 0.00 0 Not Applicable
05/19/2026 01 AM PDT 0.00 0 Not Applicable
05/19/2026 02 AM PDT 0.00 0 Not Applicable
05/19/2026 03 AM PDT 0.00 0 Not Applicable
05/19/2026 04 AM PDT 0.00 0 Not Applicable
05/19/2026 05 AM PDT 0.00 0 Not Applicable
05/19/2026 06 AM PDT 0.00 0 Not Applicable
05/19/2026 07 AM PDT 0.00 0 Not Applicable
05/19/2026 08 AM PDT 0.00 0 Not Applicable
05/19/2026 09 AM PDT 0.00 0 Not Applicable
05/19/2026 10 AM PDT 0.00 0 Not Applicable
05/19/2026 11 AM PDT 0.00 0 Not Applicable
05/19/2026 12 PM PDT 0.00 0 Not Applicable
05/19/2026 01 PM PDT 0.00 0 Not Applicable
05/19/2026 02 PM PDT 0.00 0 Not Applicable
05/19/2026 03 PM PDT 0.00 0 Not Applicable
05/19/2026 04 PM PDT 1.55 + Not Applicable
05/19/2026 05 PM PDT 1830.88 + Not Applicable
05/19/2026 06 PM PDT 612.15 - Not Applicable
05/19/2026 07 PM PDT 206.70 - Not Applicable
05/19/2026 08 PM PDT 72.23 - Not Applicable
05/19/2026 09 PM PDT 27.75 - Not Applicable
05/19/2026 10 PM PDT 12.96 - Not Applicable
05/19/2026 11 PM PDT 7.89 - Not Applicable
05/20/2026 12 AM PDT 5.96 - Not Applicable
05/20/2026 01 AM PDT 5.07 - Not Applicable
05/20/2026 02 AM PDT 4.63 - Not Applicable
05/20/2026 03 AM PDT 4.51 - Not Applicable
05/20/2026 04 AM PDT 4.82 + Not Applicable
05/20/2026 05 AM PDT 5.43 + Not Applicable
#
# NOTE 1: Stages are rounded to the nearest hundredth (.01) of a foot.
# NOTE 2: Trends are determined using hourly change in unrounded stage.
# NOTE 3: Maximum Values are determined using unrounded stage.
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