National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SANTA MARGARITA RIVER - YSIDORA (YDRC1)
Latitude: 33.31º NLongitude: 117.35º WElevation: 75 Feet
Location: San Diego County in CaliforniaBulletin Group: Southern CaliforniaRiver Group: San Diego/Inland
Issuance Time: Jan 02 2026 at 1:34 PM PSTNext Issuance: Jan 03 2026 at 9:00 AM PST
Action/Monitor: 10.85 FeetMinor Flood: 12.5 FeetModerate Flood: 13.78 FeetMajor Flood: 16.29 Feet


# Tabular Observed and Forecast Hydrograph Information
#
# Location: Santa Margarita River - Ysidora (YDRC1)
#
# File Generation Time:  01/02/2026 at 01:34 PM PST
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  01/01/2026 at 07:00 PM PST
# Maximum Observed Stage:                       10.26 Feet
# Maximum Observed Flow:                        2268 cfs
#
# Earliest Date & Time of Maximum Forecast:     01/05/2026 at 01:00 AM PST
# Maximum Forecast Stage:                       8.69 Feet
# Maximum Forecast Flow:                        508 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  12/28/2025 01 PM PST            7.66            104                        Normal
  12/28/2025 02 PM PST            7.66            104         0              Normal
  12/28/2025 03 PM PST            7.65            102         -              Normal
  12/28/2025 04 PM PST            7.63             98         -              Normal
  12/28/2025 05 PM PST            7.62             96         -              Normal
  12/28/2025 06 PM PST            7.62             96         0              Normal
  12/28/2025 07 PM PST            7.61             94         -              Normal
  12/28/2025 08 PM PST            7.59             91         -              Normal
  12/28/2025 09 PM PST            7.52             78         -              Normal
  12/28/2025 10 PM PST            7.50             74         -              Normal
  12/28/2025 11 PM PST            7.48             71         -              Normal
  12/29/2025 12 AM PST            7.46             68         -              Normal
  12/29/2025 01 AM PST            7.44             65         -              Normal
  12/29/2025 02 AM PST            7.44             65         0              Normal
  12/29/2025 03 AM PST            7.43             63         -              Normal
  12/29/2025 04 AM PST            7.43             63         0              Normal
  12/29/2025 05 AM PST            7.43             63         0              Normal
  12/29/2025 06 AM PST            7.42             62         -              Normal
  12/29/2025 07 AM PST            7.42             62         0              Normal
  12/29/2025 08 AM PST            7.43             63         +              Normal
  12/29/2025 09 AM PST            7.45             66         +              Normal
  12/29/2025 10 AM PST            7.43             63         -              Normal
  12/29/2025 11 AM PST            7.44             65         +              Normal
  12/29/2025 12 PM PST            7.41             60         -              Normal
  12/29/2025 01 PM PST            7.43             63         +              Normal
  12/29/2025 02 PM PST            7.43             63         0              Normal
  12/29/2025 03 PM PST            7.42             62         -              Normal
  12/29/2025 04 PM PST            7.42             62         0              Normal
  12/29/2025 05 PM PST            7.42             62         0              Normal
  12/29/2025 06 PM PST            7.43             63         +              Normal
  12/29/2025 07 PM PST            7.41             60         -              Normal
  12/29/2025 08 PM PST            7.41             60         0              Normal
  12/29/2025 09 PM PST            7.40             59         -              Normal
  12/29/2025 10 PM PST            7.39             57         -              Normal
  12/29/2025 11 PM PST            7.40             59         +              Normal
  12/30/2025 12 AM PST            7.39             57         -              Normal
  12/30/2025 01 AM PST            7.39             57         0              Normal
  12/30/2025 02 AM PST            7.39             57         0              Normal
  12/30/2025 03 AM PST            7.40             59         +              Normal
  12/30/2025 04 AM PST            7.39             57         -              Normal
  12/30/2025 05 AM PST            7.39             57         0              Normal
  12/30/2025 06 AM PST            7.38             56         -              Normal
  12/30/2025 07 AM PST            7.38             56         0              Normal
  12/30/2025 08 AM PST            7.37             54         -              Normal
  12/30/2025 09 AM PST            7.38             56         +              Normal
  12/30/2025 10 AM PST            7.38             56         0              Normal
  12/30/2025 11 AM PST            7.37             54         -              Normal
  12/30/2025 12 PM PST            7.37             54         0              Normal
  12/30/2025 01 PM PST            7.37             54         0              Normal
  12/30/2025 02 PM PST            7.36             53         -              Normal
  12/30/2025 03 PM PST            7.36             53         0              Normal
  12/30/2025 04 PM PST            7.36             53         0              Normal
  12/30/2025 05 PM PST            7.37             54         +              Normal
  12/30/2025 06 PM PST            7.35             51         -              Normal
  12/30/2025 07 PM PST            7.35             51         0              Normal
  12/30/2025 08 PM PST            7.34             50         -              Normal
  12/30/2025 09 PM PST            7.33             49         -              Normal
  12/30/2025 10 PM PST            7.32             47         -              Normal
  12/30/2025 11 PM PST            7.35             51         +              Normal
  12/31/2025 12 AM PST            7.34             50         -              Normal
  12/31/2025 01 AM PST            7.34             50         0              Normal
  12/31/2025 02 AM PST            7.33             49         -              Normal
  12/31/2025 03 AM PST            7.32             47         -              Normal
  12/31/2025 04 AM PST            7.31             46         -              Normal
  12/31/2025 05 AM PST            7.29             43         -              Normal
  12/31/2025 06 AM PST            7.34             50         +              Normal
  12/31/2025 07 AM PST            7.33             49         -              Normal
  12/31/2025 08 AM PST            7.33             49         0              Normal
  12/31/2025 09 AM PST            7.31             46         -              Normal
  12/31/2025 10 AM PST            7.25             39         -              Normal
  12/31/2025 11 AM PST            7.25             39         0              Normal
  12/31/2025 12 PM PST            7.27             41         +              Normal
  12/31/2025 01 PM PST            7.28             42         +              Normal
  12/31/2025 02 PM PST            7.28             42         0              Normal
  12/31/2025 03 PM PST            7.28             42         0              Normal
  12/31/2025 04 PM PST            7.29             43         +              Normal
  12/31/2025 05 PM PST            7.28             42         -              Normal
  12/31/2025 06 PM PST            7.25             39         -              Normal
  12/31/2025 07 PM PST            7.26             40         +              Normal
  12/31/2025 08 PM PST            7.26             40         0              Normal
  12/31/2025 09 PM PST            7.23             36         -              Normal
  12/31/2025 10 PM PST            7.27             41         +              Normal
  12/31/2025 11 PM PST            7.27             41         0              Normal
  01/01/2026 12 AM PST            7.24             37         -              Normal
  01/01/2026 01 AM PST            7.27             41         +              Normal
  01/01/2026 02 AM PST            7.28             42         +              Normal
  01/01/2026 03 AM PST            7.27             41         -              Normal
  01/01/2026 04 AM PST            7.30             45         +              Normal
  01/01/2026 05 AM PST            7.28             42         -              Normal
  01/01/2026 06 AM PST            7.27             41         -              Normal
  01/01/2026 07 AM PST            7.27             41         0              Normal
  01/01/2026 08 AM PST            7.30             45         +              Normal
  01/01/2026 09 AM PST            7.30             45         0              Normal
  01/01/2026 10 AM PST            7.29             43         -              Normal
  01/01/2026 11 AM PST            7.28             42         -              Normal
  01/01/2026 12 PM PST            7.27             41         -              Normal
  01/01/2026 01 PM PST            7.28             42         +              Normal
  01/01/2026 02 PM PST            7.91            171         +              Normal
  01/01/2026 03 PM PST            8.71            519         +              Normal
  01/01/2026 04 PM PST            9.25            930         +              Normal
  01/01/2026 05 PM PST            9.82           1590         +              Normal
  01/01/2026 06 PM PST           10.20           2166         +              Normal
  01/01/2026 07 PM PST           10.26           2268         +              Normal
  01/01/2026 08 PM PST           10.13           2051         -              Normal
  01/01/2026 09 PM PST            9.84           1617         -              Normal
  01/01/2026 10 PM PST            9.61           1320         -              Normal
  01/01/2026 11 PM PST            9.41           1092         -              Normal
  01/02/2026 12 AM PST            9.24            920         -              Normal
  01/02/2026 01 AM PST            9.12            810         -              Normal
  01/02/2026 02 AM PST            9.03            734         -              Normal
  01/02/2026 03 AM PST            8.96            678         -              Normal
  01/02/2026 04 AM PST            8.89            630         -              Normal
  01/02/2026 05 AM PST            8.81            579         -              Normal
  01/02/2026 06 AM PST            8.76            549         -              Normal
  01/02/2026 07 AM PST            8.68            502         -              Normal
  01/02/2026 08 AM PST            8.62            468         -              Normal
  01/02/2026 09 AM PST            8.45            381         -              Normal
  01/02/2026 10 AM PST            8.33            326         -              Normal
  01/02/2026 11 AM PST            8.23            284         -              Normal
  01/02/2026 12 PM PST            8.19            268         -              Normal
  01/02/2026 01 PM PST            8.16            256         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  01/02/2026 02 PM PST            8.16            256                        Normal
  01/02/2026 03 PM PST            8.16            256         0              Normal
  01/02/2026 04 PM PST            8.16            256         0              Normal
  01/02/2026 05 PM PST            8.18            264         +              Normal
  01/02/2026 06 PM PST            8.19            268         +              Normal
  01/02/2026 07 PM PST            8.22            280         +              Normal
  01/02/2026 08 PM PST            8.27            300         +              Normal
  01/02/2026 09 PM PST            8.31            317         +              Normal
  01/02/2026 10 PM PST            8.35            335         +              Normal
  01/02/2026 11 PM PST            8.38            348         +              Normal
  01/03/2026 12 AM PST            8.41            362         +              Normal
  01/03/2026 01 AM PST            8.45            381         +              Normal
  01/03/2026 02 AM PST            8.50            406         +              Normal
  01/03/2026 03 AM PST            8.53            421         +              Normal
  01/03/2026 04 AM PST            8.54            426         +              Normal
  01/03/2026 05 AM PST            8.55            431         +              Normal
  01/03/2026 06 AM PST            8.55            431         0              Normal
  01/03/2026 07 AM PST            8.56            436         +              Normal
  01/03/2026 08 AM PST            8.55            431         -              Normal
  01/03/2026 09 AM PST            8.54            426         -              Normal
  01/03/2026 10 AM PST            8.51            411         -              Normal
  01/03/2026 11 AM PST            8.48            396         -              Normal
  01/03/2026 12 PM PST            8.46            386         -              Normal
  01/03/2026 01 PM PST            8.43            371         -              Normal
  01/03/2026 02 PM PST            8.40            357         -              Normal
  01/03/2026 03 PM PST            8.38            348         -              Normal
  01/03/2026 04 PM PST            8.36            339         -              Normal
  01/03/2026 05 PM PST            8.35            335         -              Normal
  01/03/2026 06 PM PST            8.33            326         -              Normal
  01/03/2026 07 PM PST            8.30            313         -              Normal
  01/03/2026 08 PM PST            8.28            304         -              Normal
  01/03/2026 09 PM PST            8.25            292         -              Normal
  01/03/2026 10 PM PST            8.22            280         -              Normal
  01/03/2026 11 PM PST            8.18            264         -              Normal
  01/04/2026 12 AM PST            8.13            245         -              Normal
  01/04/2026 01 AM PST            8.08            227         -              Normal
  01/04/2026 02 AM PST            8.03            210         -              Normal
  01/04/2026 03 AM PST            7.98            193         -              Normal
  01/04/2026 04 AM PST            7.93            177         -              Normal
  01/04/2026 05 AM PST            7.88            162         -              Normal
  01/04/2026 06 AM PST            7.84            150         -              Normal
  01/04/2026 07 AM PST            7.80            139         -              Normal
  01/04/2026 08 AM PST            7.77            131         -              Normal
  01/04/2026 09 AM PST            7.76            128         -              Normal
  01/04/2026 10 AM PST            7.77            131         +              Normal
  01/04/2026 11 AM PST            7.81            141         +              Normal
  01/04/2026 12 PM PST            7.86            156         +              Normal
  01/04/2026 01 PM PST            7.93            177         +              Normal
  01/04/2026 02 PM PST            7.99            196         +              Normal
  01/04/2026 03 PM PST            8.05            217         +              Normal
  01/04/2026 04 PM PST            8.11            238         +              Normal
  01/04/2026 05 PM PST            8.16            256         +              Normal
  01/04/2026 06 PM PST            8.22            280         +              Normal
  01/04/2026 07 PM PST            8.29            308         +              Normal
  01/04/2026 08 PM PST            8.37            344         +              Normal
  01/04/2026 09 PM PST            8.45            381         +              Normal
  01/04/2026 10 PM PST            8.54            426         +              Normal
  01/04/2026 11 PM PST            8.61            463         +              Normal
  01/05/2026 12 AM PST            8.66            491         +              Normal
  01/05/2026 01 AM PST            8.69            508         +              Normal
  01/05/2026 02 AM PST            8.68            502         -              Normal
  01/05/2026 03 AM PST            8.64            479         -              Normal
  01/05/2026 04 AM PST            8.61            463         -              Normal
  01/05/2026 05 AM PST            8.58            447         -              Normal
  01/05/2026 06 AM PST            8.57            442         -              Normal
  01/05/2026 07 AM PST            8.60            458         +              Normal
  01/05/2026 08 AM PST            8.66            491         +              Normal
  01/05/2026 09 AM PST            8.69            508         +              Normal
  01/05/2026 10 AM PST            8.68            502         -              Normal
  01/05/2026 11 AM PST            8.65            485         -              Normal
  01/05/2026 12 PM PST            8.62            468         -              Normal
  01/05/2026 01 PM PST            8.57            442         -              Normal
  01/05/2026 02 PM PST            8.53            421         -              Normal
  01/05/2026 03 PM PST            8.49            401         -              Normal
  01/05/2026 04 PM PST            8.45            381         -              Normal
  01/05/2026 05 PM PST            8.41            362         -              Normal
  01/05/2026 06 PM PST            8.36            339         -              Normal
  01/05/2026 07 PM PST            8.31            317         -              Normal
  01/05/2026 08 PM PST            8.26            296         -              Normal
  01/05/2026 09 PM PST            8.21            276         -              Normal
  01/05/2026 10 PM PST            8.16            256         -              Normal
  01/05/2026 11 PM PST            8.11            238         -              Normal
  01/06/2026 12 AM PST            8.05            217         -              Normal
  01/06/2026 01 AM PST            7.99            196         -              Normal
  01/06/2026 02 AM PST            7.94            180         -              Normal
  01/06/2026 03 AM PST            7.89            165         -              Normal
  01/06/2026 04 AM PST            7.85            153         -              Normal
  01/06/2026 05 AM PST            7.81            141         -              Normal
  01/06/2026 06 AM PST            7.76            128         -              Normal
  01/06/2026 07 AM PST            7.73            120         -              Normal
  01/06/2026 08 AM PST            7.69            111         -              Normal
  01/06/2026 09 AM PST            7.66            104         -              Normal
  01/06/2026 10 AM PST            7.62             96         -              Normal
  01/06/2026 11 AM PST            7.59             91         -              Normal
  01/06/2026 12 PM PST            7.56             85         -              Normal
  01/06/2026 01 PM PST            7.54             81         -              Normal
  01/06/2026 02 PM PST            7.51             76         -              Normal
  01/06/2026 03 PM PST            7.50             74         -              Normal
  01/06/2026 04 PM PST            7.48             71         -              Normal
  01/06/2026 05 PM PST            7.47             69         -              Normal
  01/06/2026 06 PM PST            7.46             68         -              Normal
  01/06/2026 07 PM PST            7.45             66         -              Normal
  01/06/2026 08 PM PST            7.44             65         -              Normal
  01/06/2026 09 PM PST            7.43             63         -              Normal
  01/06/2026 10 PM PST            7.43             63         0              Normal
  01/06/2026 11 PM PST            7.44             65         +              Normal
  01/07/2026 12 AM PST            7.47             69         +              Normal
  01/07/2026 01 AM PST            7.52             78         +              Normal
  01/07/2026 02 AM PST            7.58             89         +              Normal
  01/07/2026 03 AM PST            7.64            100         +              Normal
  01/07/2026 04 AM PST            7.70            113         +              Normal
#
# NOTE 1: Stages are rounded to the nearest hundredth (.01) of a foot.
# NOTE 2: Flows are rounded to the nearest (1) cfs.
# NOTE 3: Trends are determined using hourly change in unrounded stage and flow.
# NOTE 4: Maximum Values are determined using unrounded stage and flow.