MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 FeetForecast Type: Official Location
Location: Mariposa County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Feb 26 2026 at 1:57 PM PSTNext Issuance: Feb 27 2026 at 9:00 AM PST
Action/Monitor: N/A Minor Flood: 7.5 FeetModerate Flood: 10.0 FeetMajor Flood: 13.27 Feet

# Tabular Observed and Forecast Hydrograph Information
#
# Location: Merced River - Yosemite NP at Happy Isles (HPIC1)
#
# File Generation Time:  02/26/2026 at 01:57 PM PST
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  02/26/2026 at 05:00 AM PST
# Maximum Observed Stage:                       3.53 Feet
# Maximum Observed Flow:                        568 cfs
#
# Earliest Date & Time of Maximum Forecast:     03/01/2026 at 12:00 AM PST
# Maximum Forecast Stage:                       4.70 Feet
# Maximum Forecast Flow:                        1197 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  02/21/2026 01 PM PST            2.47            211                        Normal
  02/21/2026 02 PM PST            2.44            204         -              Normal
  02/21/2026 03 PM PST            2.47            211         +              Normal
  02/21/2026 04 PM PST            2.47            211         0              Normal
  02/21/2026 05 PM PST            2.47            211         0              Normal
  02/21/2026 06 PM PST            2.44            204         -              Normal
  02/21/2026 07 PM PST            2.44            204         0              Normal
  02/21/2026 08 PM PST            2.43            201         -              Normal
  02/21/2026 09 PM PST            2.43            201         0              Normal
  02/21/2026 10 PM PST            2.43            201         0              Normal
  02/21/2026 11 PM PST            2.43            201         0              Normal
  02/22/2026 12 AM PST            2.43            201         0              Normal
  02/22/2026 01 AM PST            2.42            198         -              Normal
  02/22/2026 02 AM PST            2.40            193         -              Normal
  02/22/2026 03 AM PST            2.39            190         -              Normal
  02/22/2026 04 AM PST            2.37            185         -              Normal
  02/22/2026 05 AM PST            2.36            183         -              Normal
  02/22/2026 06 AM PST            2.34            177         -              Normal
  02/22/2026 07 AM PST            2.32            172         -              Normal
  02/22/2026 08 AM PST            2.32            172         0              Normal
  02/22/2026 09 AM PST            2.31            169         -              Normal
  02/22/2026 10 AM PST            2.33            175         +              Normal
  02/22/2026 11 AM PST            2.35            180         +              Normal
  02/22/2026 12 PM PST            2.35            180         0              Normal
  02/22/2026 01 PM PST            2.35            180         0              Normal
  02/22/2026 02 PM PST            2.36            183         +              Normal
  02/22/2026 03 PM PST            2.36            183         0              Normal
  02/22/2026 04 PM PST            2.38            188         +              Normal
  02/22/2026 05 PM PST            2.38            188         0              Normal
  02/22/2026 06 PM PST            2.38            188         0              Normal
  02/22/2026 07 PM PST            2.40            193         +              Normal
  02/22/2026 08 PM PST            2.40            193         0              Normal
  02/22/2026 09 PM PST            2.41            196         +              Normal
  02/22/2026 10 PM PST            2.40            193         -              Normal
  02/22/2026 11 PM PST            2.39            190         -              Normal
  02/23/2026 12 AM PST            2.37            185         -              Normal
  02/23/2026 01 AM PST            2.36            183         -              Normal
  02/23/2026 02 AM PST            2.35            180         -              Normal
  02/23/2026 03 AM PST            2.35            180         0              Normal
  02/23/2026 04 AM PST            2.34            177         -              Normal
  02/23/2026 05 AM PST            2.34            177         0              Normal
  02/23/2026 06 AM PST            2.33            175         -              Normal
  02/23/2026 07 AM PST            2.33            175         0              Normal
  02/23/2026 08 AM PST            2.32            172         -              Normal
  02/23/2026 09 AM PST            2.32            172         0              Normal
  02/23/2026 10 AM PST            2.33            175         +              Normal
  02/23/2026 11 AM PST            2.33            175         0              Normal
  02/23/2026 12 PM PST            2.35            180         +              Normal
  02/23/2026 01 PM PST            2.35            180         0              Normal
  02/23/2026 02 PM PST            2.37            185         +              Normal
  02/23/2026 03 PM PST            2.37            185         0              Normal
  02/23/2026 04 PM PST            2.37            185         0              Normal
  02/23/2026 05 PM PST            2.38            188         +              Normal
  02/23/2026 06 PM PST            2.40            193         +              Normal
  02/23/2026 07 PM PST            2.41            196         +              Normal
  02/23/2026 08 PM PST            2.42            198         +              Normal
  02/23/2026 09 PM PST            2.42            198         0              Normal
  02/23/2026 10 PM PST            2.43            201         +              Normal
  02/23/2026 11 PM PST            2.43            201         0              Normal
  02/24/2026 12 AM PST            2.43            201         0              Normal
  02/24/2026 01 AM PST            2.43            201         0              Normal
  02/24/2026 02 AM PST            2.44            204         +              Normal
  02/24/2026 03 AM PST            2.45            206         +              Normal
  02/24/2026 04 AM PST            2.46            209         +              Normal
  02/24/2026 05 AM PST            2.46            209         0              Normal
  02/24/2026 06 AM PST            2.47            211         +              Normal
  02/24/2026 07 AM PST            2.46            209         -              Normal
  02/24/2026 08 AM PST            2.47            211         +              Normal
  02/24/2026 09 AM PST            2.49            216         +              Normal
  02/24/2026 10 AM PST            2.52            224         +              Normal
  02/24/2026 11 AM PST            2.52            224         0              Normal
  02/24/2026 12 PM PST            2.54            229         +              Normal
  02/24/2026 01 PM PST            2.56            234         +              Normal
  02/24/2026 02 PM PST            2.57            237         +              Normal
  02/24/2026 03 PM PST            2.60            245         +              Normal
  02/24/2026 04 PM PST            2.63            253         +              Normal
  02/24/2026 05 PM PST            2.64            256         +              Normal
  02/24/2026 06 PM PST            2.67            264         +              Normal
  02/24/2026 07 PM PST            2.69            270         +              Normal
  02/24/2026 08 PM PST            2.71            276         +              Normal
  02/24/2026 09 PM PST            2.74            284         +              Normal
  02/24/2026 10 PM PST            2.77            293         +              Normal
  02/24/2026 11 PM PST            2.77            293         0              Normal
  02/25/2026 12 AM PST            2.80            302         +              Normal
  02/25/2026 01 AM PST            2.82            308         +              Normal
  02/25/2026 02 AM PST            2.83            311         +              Normal
  02/25/2026 03 AM PST            2.86            320         +              Normal
  02/25/2026 04 AM PST            2.87            324         +              Normal
  02/25/2026 05 AM PST            2.88            327         +              Normal
  02/25/2026 06 AM PST            2.90            333         +              Normal
  02/25/2026 07 AM PST            2.92            340         +              Normal
  02/25/2026 08 AM PST            2.91            336         -              Normal
  02/25/2026 09 AM PST            2.93            343         +              Normal
  02/25/2026 10 AM PST            2.93            343         0              Normal
  02/25/2026 11 AM PST            2.97            356         +              Normal
  02/25/2026 12 PM PST            2.96            353         -              Normal
  02/25/2026 01 PM PST            3.00            366         +              Normal
  02/25/2026 02 PM PST            3.03            376         +              Normal
  02/25/2026 03 PM PST            3.06            386         +              Normal
  02/25/2026 04 PM PST            3.12            407         +              Normal
  02/25/2026 05 PM PST            3.18            429         +              Normal
  02/25/2026 06 PM PST            3.23            448         +              Normal
  02/25/2026 07 PM PST            3.30            474         +              Normal
  02/25/2026 08 PM PST            3.33            486         +              Normal
  02/25/2026 09 PM PST            3.39            510         +              Normal
  02/25/2026 10 PM PST            3.44            531         +              Normal
  02/25/2026 11 PM PST            3.45            535         +              Normal
  02/26/2026 12 AM PST            3.46            539         +              Normal
  02/26/2026 01 AM PST            3.48            547         +              Normal
  02/26/2026 02 AM PST            3.52            564         +              Normal
  02/26/2026 03 AM PST            3.51            560         -              Normal
  02/26/2026 04 AM PST            3.49            551         -              Normal
  02/26/2026 05 AM PST            3.53            568         +              Normal
  02/26/2026 06 AM PST            3.52            564         -              Normal
  02/26/2026 07 AM PST            3.48            547         -              Normal
  02/26/2026 08 AM PST            3.47            543         -              Normal
  02/26/2026 09 AM PST            3.45            535         -              Normal
  02/26/2026 10 AM PST            3.46            539         +              Normal
  02/26/2026 11 AM PST            3.45            535         -              Normal
  02/26/2026 12 PM PST            3.42            522         -              Normal
  02/26/2026 01 PM PST            3.46            539         +              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  02/26/2026 02 PM PST            3.52            564                        Normal
  02/26/2026 03 PM PST            3.58            590         +              Normal
  02/26/2026 04 PM PST            3.66            626         +              Normal
  02/26/2026 05 PM PST            3.66            626         0              Normal
  02/26/2026 06 PM PST            3.66            626         0              Normal
  02/26/2026 07 PM PST            3.66            626         0              Normal
  02/26/2026 08 PM PST            3.66            626         0              Normal
  02/26/2026 09 PM PST            3.65            621         -              Normal
  02/26/2026 10 PM PST            3.65            621         0              Normal
  02/26/2026 11 PM PST            3.69            639         +              Normal
  02/27/2026 12 AM PST            3.70            644         +              Normal
  02/27/2026 01 AM PST            3.72            653         +              Normal
  02/27/2026 02 AM PST            3.72            653         0              Normal
  02/27/2026 03 AM PST            3.72            653         0              Normal
  02/27/2026 04 AM PST            3.73            658         +              Normal
  02/27/2026 05 AM PST            3.76            672         +              Normal
  02/27/2026 06 AM PST            3.79            686         +              Normal
  02/27/2026 07 AM PST            3.83            705         +              Normal
  02/27/2026 08 AM PST            3.85            715         +              Normal
  02/27/2026 09 AM PST            3.89            735         +              Normal
  02/27/2026 10 AM PST            3.91            745         +              Normal
  02/27/2026 11 AM PST            3.96            770         +              Normal
  02/27/2026 12 PM PST            4.02            801         +              Normal
  02/27/2026 01 PM PST            4.04            811         +              Normal
  02/27/2026 02 PM PST            4.09            837         +              Normal
  02/27/2026 03 PM PST            4.14            864         +              Normal
  02/27/2026 04 PM PST            4.21            903         +              Normal
  02/27/2026 05 PM PST            4.23            914         +              Normal
  02/27/2026 06 PM PST            4.26            930         +              Normal
  02/27/2026 07 PM PST            4.29            948         +              Normal
  02/27/2026 08 PM PST            4.31            959         +              Normal
  02/27/2026 09 PM PST            4.34            976         +              Normal
  02/27/2026 10 PM PST            4.37            994         +              Normal
  02/27/2026 11 PM PST            4.40           1011         +              Normal
  02/28/2026 12 AM PST            4.41           1017         +              Normal
  02/28/2026 01 AM PST            4.41           1017         0              Normal
  02/28/2026 02 AM PST            4.41           1017         0              Normal
  02/28/2026 03 AM PST            4.40           1011         -              Normal
  02/28/2026 04 AM PST            4.40           1011         0              Normal
  02/28/2026 05 AM PST            4.42           1023         +              Normal
  02/28/2026 06 AM PST            4.43           1029         +              Normal
  02/28/2026 07 AM PST            4.44           1035         +              Normal
  02/28/2026 08 AM PST            4.45           1041         +              Normal
  02/28/2026 09 AM PST            4.48           1059         +              Normal
  02/28/2026 10 AM PST            4.48           1059         0              Normal
  02/28/2026 11 AM PST            4.47           1053         -              Normal
  02/28/2026 12 PM PST            4.48           1059         +              Normal
  02/28/2026 01 PM PST            4.47           1053         -              Normal
  02/28/2026 02 PM PST            4.48           1059         +              Normal
  02/28/2026 03 PM PST            4.49           1065         +              Normal
  02/28/2026 04 PM PST            4.53           1090         +              Normal
  02/28/2026 05 PM PST            4.55           1102         +              Normal
  02/28/2026 06 PM PST            4.57           1115         +              Normal
  02/28/2026 07 PM PST            4.59           1127         +              Normal
  02/28/2026 08 PM PST            4.61           1140         +              Normal
  02/28/2026 09 PM PST            4.63           1152         +              Normal
  02/28/2026 10 PM PST            4.65           1165         +              Normal
  02/28/2026 11 PM PST            4.67           1178         +              Normal
  03/01/2026 12 AM PST            4.70           1197         +              Normal
  03/01/2026 01 AM PST            4.69           1191         -              Normal
  03/01/2026 02 AM PST            4.68           1184         -              Normal
  03/01/2026 03 AM PST            4.67           1178         -              Normal
  03/01/2026 04 AM PST            4.67           1178         0              Normal
  03/01/2026 05 AM PST            4.65           1165         -              Normal
  03/01/2026 06 AM PST            4.63           1152         -              Normal
  03/01/2026 07 AM PST            4.61           1140         -              Normal
  03/01/2026 08 AM PST            4.58           1121         -              Normal
  03/01/2026 09 AM PST            4.56           1108         -              Normal
  03/01/2026 10 AM PST            4.52           1084         -              Normal
  03/01/2026 11 AM PST            4.50           1071         -              Normal
  03/01/2026 12 PM PST            4.45           1041         -              Normal
  03/01/2026 01 PM PST            4.45           1041         0              Normal
  03/01/2026 02 PM PST            4.45           1041         0              Normal
  03/01/2026 03 PM PST            4.49           1065         +              Normal
  03/01/2026 04 PM PST            4.51           1077         +              Normal
  03/01/2026 05 PM PST            4.53           1090         +              Normal
  03/01/2026 06 PM PST            4.55           1102         +              Normal
  03/01/2026 07 PM PST            4.57           1115         +              Normal
  03/01/2026 08 PM PST            4.57           1115         0              Normal
  03/01/2026 09 PM PST            4.57           1115         0              Normal
  03/01/2026 10 PM PST            4.56           1108         -              Normal
  03/01/2026 11 PM PST            4.53           1090         -              Normal
  03/02/2026 12 AM PST            4.49           1065         -              Normal
  03/02/2026 01 AM PST            4.45           1041         -              Normal
  03/02/2026 02 AM PST            4.40           1011         -              Normal
  03/02/2026 03 AM PST            4.35            982         -              Normal
  03/02/2026 04 AM PST            4.31            959         -              Normal
  03/02/2026 05 AM PST            4.29            948         -              Normal
  03/02/2026 06 AM PST            4.26            930         -              Normal
  03/02/2026 07 AM PST            4.23            914         -              Normal
  03/02/2026 08 AM PST            4.20            897         -              Normal
  03/02/2026 09 AM PST            4.18            886         -              Normal
  03/02/2026 10 AM PST            4.14            864         -              Normal
  03/02/2026 11 AM PST            4.13            859         -              Normal
  03/02/2026 12 PM PST            4.10            843         -              Normal
  03/02/2026 01 PM PST            4.10            843         0              Normal
  03/02/2026 02 PM PST            4.10            843         0              Normal
  03/02/2026 03 PM PST            4.12            853         +              Normal
  03/02/2026 04 PM PST            4.13            859         +              Normal
  03/02/2026 05 PM PST            4.14            864         +              Normal
  03/02/2026 06 PM PST            4.15            870         +              Normal
  03/02/2026 07 PM PST            4.16            875         +              Normal
  03/02/2026 08 PM PST            4.16            875         0              Normal
  03/02/2026 09 PM PST            4.15            870         -              Normal
  03/02/2026 10 PM PST            4.14            864         -              Normal
  03/02/2026 11 PM PST            4.13            859         -              Normal
  03/03/2026 12 AM PST            4.11            848         -              Normal
  03/03/2026 01 AM PST            4.09            837         -              Normal
  03/03/2026 02 AM PST            4.07            827         -              Normal
  03/03/2026 03 AM PST            4.05            816         -              Normal
  03/03/2026 04 AM PST            4.03            806         -              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.