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: Mar 31 2026 at 2:22 PM PDTNext Issuance: Apr 01 2026 at 9:00 AM PDT
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:  03/31/2026 at 02:22 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  03/29/2026 at 03:00 AM PDT
# Maximum Observed Stage:                       4.87 Feet
# Maximum Observed Flow:                        1309 cfs
#
# Earliest Date & Time of Maximum Forecast:     03/31/2026 at 11:00 PM PDT
# Maximum Forecast Stage:                       4.71 Feet
# Maximum Forecast Flow:                        1204 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/26/2026 02 PM PDT            4.75           1229                        Normal
  03/26/2026 03 PM PDT            4.65           1165         -              Normal
  03/26/2026 04 PM PDT            4.64           1159         -              Normal
  03/26/2026 05 PM PDT            4.62           1146         -              Normal
  03/26/2026 06 PM PDT            4.59           1127         -              Normal
  03/26/2026 07 PM PDT            4.59           1127         0              Normal
  03/26/2026 08 PM PDT            4.59           1127         0              Normal
  03/26/2026 09 PM PDT            4.66           1171         +              Normal
  03/26/2026 10 PM PDT            4.67           1178         +              Normal
  03/26/2026 11 PM PDT            4.70           1197         +              Normal
  03/27/2026 12 AM PDT            4.72           1210         +              Normal
  03/27/2026 01 AM PDT            4.70           1197         -              Normal
  03/27/2026 02 AM PDT            4.71           1204         +              Normal
  03/27/2026 03 AM PDT            4.69           1191         -              Normal
  03/27/2026 04 AM PDT            4.69           1191         0              Normal
  03/27/2026 05 AM PDT            4.66           1171         -              Normal
  03/27/2026 06 AM PDT            4.67           1178         +              Normal
  03/27/2026 07 AM PDT            4.63           1152         -              Normal
  03/27/2026 08 AM PDT            4.59           1127         -              Normal
  03/27/2026 09 AM PDT            4.60           1133         +              Normal
  03/27/2026 10 AM PDT            4.58           1121         -              Normal
  03/27/2026 11 AM PDT            4.52           1084         -              Normal
  03/27/2026 12 PM PDT            4.52           1084         0              Normal
  03/27/2026 01 PM PDT            4.47           1053         -              Normal
  03/27/2026 02 PM PDT            4.44           1035         -              Normal
  03/27/2026 03 PM PDT            4.42           1023         -              Normal
  03/27/2026 04 PM PDT            4.38           1000         -              Normal
  03/27/2026 05 PM PDT            4.43           1029         +              Normal
  03/27/2026 06 PM PDT            4.45           1041         +              Normal
  03/27/2026 07 PM PDT            4.52           1084         +              Normal
  03/27/2026 08 PM PDT            4.63           1152         +              Normal
  03/27/2026 09 PM PDT            4.66           1171         +              Normal
  03/27/2026 10 PM PDT            4.73           1216         +              Normal
  03/27/2026 11 PM PDT            4.79           1256         +              Normal
  03/28/2026 12 AM PDT            4.83           1282         +              Normal
  03/28/2026 01 AM PDT            4.82           1275         -              Normal
  03/28/2026 02 AM PDT            4.84           1289         +              Normal
  03/28/2026 03 AM PDT            4.84           1289         0              Normal
  03/28/2026 04 AM PDT            4.82           1275         -              Normal
  03/28/2026 05 AM PDT            4.83           1282         +              Normal
  03/28/2026 06 AM PDT            4.79           1256         -              Normal
  03/28/2026 07 AM PDT            4.77           1242         -              Normal
  03/28/2026 08 AM PDT            4.71           1204         -              Normal
  03/28/2026 09 AM PDT            4.67           1178         -              Normal
  03/28/2026 10 AM PDT            4.67           1178         0              Normal
  03/28/2026 11 AM PDT            4.61           1140         -              Normal
  03/28/2026 12 PM PDT            4.58           1121         -              Normal
  03/28/2026 01 PM PDT            4.57           1115         -              Normal
  03/28/2026 02 PM PDT            4.56           1108         -              Normal
  03/28/2026 03 PM PDT            4.51           1077         -              Normal
  03/28/2026 04 PM PDT            4.48           1059         -              Normal
  03/28/2026 05 PM PDT            4.46           1047         -              Normal
  03/28/2026 06 PM PDT            4.47           1053         +              Normal
  03/28/2026 07 PM PDT            4.47           1053         0              Normal
  03/28/2026 08 PM PDT            4.57           1115         +              Normal
  03/28/2026 09 PM PDT            4.66           1171         +              Normal
  03/28/2026 10 PM PDT            4.74           1223         +              Normal
  03/28/2026 11 PM PDT            4.77           1242         +              Normal
  03/29/2026 12 AM PDT            4.84           1289         +              Normal
  03/29/2026 01 AM PDT            4.86           1302         +              Normal
  03/29/2026 02 AM PDT            4.83           1282         -              Normal
  03/29/2026 03 AM PDT            4.87           1309         +              Normal
  03/29/2026 04 AM PDT            4.86           1302         -              Normal
  03/29/2026 05 AM PDT            4.82           1275         -              Normal
  03/29/2026 06 AM PDT            4.78           1249         -              Normal
  03/29/2026 07 AM PDT            4.76           1236         -              Normal
  03/29/2026 08 AM PDT            4.73           1216         -              Normal
  03/29/2026 09 AM PDT            4.73           1216         0              Normal
  03/29/2026 10 AM PDT            4.69           1191         -              Normal
  03/29/2026 11 AM PDT            4.67           1178         -              Normal
  03/29/2026 12 PM PDT            4.60           1133         -              Normal
  03/29/2026 01 PM PDT            4.58           1121         -              Normal
  03/29/2026 02 PM PDT            4.52           1084         -              Normal
  03/29/2026 03 PM PDT            4.56           1108         +              Normal
  03/29/2026 04 PM PDT            4.49           1065         -              Normal
  03/29/2026 05 PM PDT            4.46           1047         -              Normal
  03/29/2026 06 PM PDT            4.46           1047         0              Normal
  03/29/2026 07 PM PDT            4.48           1059         +              Normal
  03/29/2026 08 PM PDT            4.51           1077         +              Normal
  03/29/2026 09 PM PDT            4.59           1127         +              Normal
  03/29/2026 10 PM PDT            4.66           1171         +              Normal
  03/29/2026 11 PM PDT            4.72           1210         +              Normal
  03/30/2026 12 AM PDT            4.73           1216         +              Normal
  03/30/2026 01 AM PDT            4.78           1249         +              Normal
  03/30/2026 02 AM PDT            4.76           1236         -              Normal
  03/30/2026 03 AM PDT            4.77           1242         +              Normal
  03/30/2026 04 AM PDT            4.76           1236         -              Normal
  03/30/2026 05 AM PDT            4.74           1223         -              Normal
  03/30/2026 06 AM PDT            4.75           1229         +              Normal
  03/30/2026 07 AM PDT            4.70           1197         -              Normal
  03/30/2026 08 AM PDT            4.67           1178         -              Normal
  03/30/2026 09 AM PDT            4.66           1171         -              Normal
  03/30/2026 10 AM PDT            4.64           1159         -              Normal
  03/30/2026 11 AM PDT            4.58           1121         -              Normal
  03/30/2026 12 PM PDT            4.57           1115         -              Normal
  03/30/2026 01 PM PDT            4.51           1077         -              Normal
  03/30/2026 02 PM PDT            4.49           1065         -              Normal
  03/30/2026 03 PM PDT            4.47           1053         -              Normal
  03/30/2026 04 PM PDT            4.43           1029         -              Normal
  03/30/2026 05 PM PDT            4.41           1017         -              Normal
  03/30/2026 06 PM PDT            4.38           1000         -              Normal
  03/30/2026 07 PM PDT            4.36            988         -              Normal
  03/30/2026 08 PM PDT            4.39           1005         +              Normal
  03/30/2026 09 PM PDT            4.35            982         -              Normal
  03/30/2026 10 PM PDT            4.38           1000         +              Normal
  03/30/2026 11 PM PDT            4.41           1017         +              Normal
  03/31/2026 12 AM PDT            4.41           1017         0              Normal
  03/31/2026 01 AM PDT            4.41           1017         0              Normal
  03/31/2026 02 AM PDT            4.40           1011         -              Normal
  03/31/2026 03 AM PDT            4.38           1000         -              Normal
  03/31/2026 04 AM PDT            4.39           1005         +              Normal
  03/31/2026 05 AM PDT            4.36            988         -              Normal
  03/31/2026 06 AM PDT            4.35            982         -              Normal
  03/31/2026 07 AM PDT            4.33            970         -              Normal
  03/31/2026 08 AM PDT            4.32            965         -              Normal
  03/31/2026 09 AM PDT            4.30            953         -              Normal
  03/31/2026 10 AM PDT            4.28            942         -              Normal
  03/31/2026 11 AM PDT            4.25            925         -              Normal
  03/31/2026 12 PM PDT            4.22            908         -              Normal
  03/31/2026 01 PM PDT            4.24            919         +              Normal
  03/31/2026 02 PM PDT            4.26            930         +              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  03/31/2026 03 PM PDT            4.29            948                        Normal
  03/31/2026 04 PM PDT            4.32            965         +              Normal
  03/31/2026 05 PM PDT            4.37            994         +              Normal
  03/31/2026 06 PM PDT            4.43           1029         +              Normal
  03/31/2026 07 PM PDT            4.49           1065         +              Normal
  03/31/2026 08 PM PDT            4.56           1108         +              Normal
  03/31/2026 09 PM PDT            4.61           1140         +              Normal
  03/31/2026 10 PM PDT            4.67           1178         +              Normal
  03/31/2026 11 PM PDT            4.71           1204         +              Normal
  04/01/2026 12 AM PDT            4.70           1197         -              Normal
  04/01/2026 01 AM PDT            4.70           1197         0              Normal
  04/01/2026 02 AM PDT            4.70           1197         0              Normal
  04/01/2026 03 AM PDT            4.69           1191         -              Normal
  04/01/2026 04 AM PDT            4.69           1191         0              Normal
  04/01/2026 05 AM PDT            4.68           1184         -              Normal
  04/01/2026 06 AM PDT            4.65           1165         -              Normal
  04/01/2026 07 AM PDT            4.62           1146         -              Normal
  04/01/2026 08 AM PDT            4.59           1127         -              Normal
  04/01/2026 09 AM PDT            4.57           1115         -              Normal
  04/01/2026 10 AM PDT            4.53           1090         -              Normal
  04/01/2026 11 AM PDT            4.50           1071         -              Normal
  04/01/2026 12 PM PDT            4.48           1059         -              Normal
  04/01/2026 01 PM PDT            4.45           1041         -              Normal
  04/01/2026 02 PM PDT            4.43           1029         -              Normal
  04/01/2026 03 PM PDT            4.40           1011         -              Normal
  04/01/2026 04 PM PDT            4.38           1000         -              Normal
  04/01/2026 05 PM PDT            4.37            994         -              Normal
  04/01/2026 06 PM PDT            4.38           1000         +              Normal
  04/01/2026 07 PM PDT            4.40           1011         +              Normal
  04/01/2026 08 PM PDT            4.42           1023         +              Normal
  04/01/2026 09 PM PDT            4.43           1029         +              Normal
  04/01/2026 10 PM PDT            4.45           1041         +              Normal
  04/01/2026 11 PM PDT            4.46           1047         +              Normal
  04/02/2026 12 AM PDT            4.48           1059         +              Normal
  04/02/2026 01 AM PDT            4.49           1065         +              Normal
  04/02/2026 02 AM PDT            4.50           1071         +              Normal
  04/02/2026 03 AM PDT            4.51           1077         +              Normal
  04/02/2026 04 AM PDT            4.52           1084         +              Normal
  04/02/2026 05 AM PDT            4.53           1090         +              Normal
  04/02/2026 06 AM PDT            4.51           1077         -              Normal
  04/02/2026 07 AM PDT            4.49           1065         -              Normal
  04/02/2026 08 AM PDT            4.46           1047         -              Normal
  04/02/2026 09 AM PDT            4.44           1035         -              Normal
  04/02/2026 10 AM PDT            4.42           1023         -              Normal
  04/02/2026 11 AM PDT            4.39           1005         -              Normal
  04/02/2026 12 PM PDT            4.35            982         -              Normal
  04/02/2026 01 PM PDT            4.31            959         -              Normal
  04/02/2026 02 PM PDT            4.28            942         -              Normal
  04/02/2026 03 PM PDT            4.24            919         -              Normal
  04/02/2026 04 PM PDT            4.20            897         -              Normal
  04/02/2026 05 PM PDT            4.17            880         -              Normal
  04/02/2026 06 PM PDT            4.17            880         0              Normal
  04/02/2026 07 PM PDT            4.16            875         -              Normal
  04/02/2026 08 PM PDT            4.16            875         0              Normal
  04/02/2026 09 PM PDT            4.16            875         0              Normal
  04/02/2026 10 PM PDT            4.16            875         0              Normal
  04/02/2026 11 PM PDT            4.14            864         -              Normal
  04/03/2026 12 AM PDT            4.14            864         0              Normal
  04/03/2026 01 AM PDT            4.14            864         0              Normal
  04/03/2026 02 AM PDT            4.13            859         -              Normal
  04/03/2026 03 AM PDT            4.12            853         -              Normal
  04/03/2026 04 AM PDT            4.10            843         -              Normal
  04/03/2026 05 AM PDT            4.09            837         -              Normal
  04/03/2026 06 AM PDT            4.07            827         -              Normal
  04/03/2026 07 AM PDT            4.05            816         -              Normal
  04/03/2026 08 AM PDT            4.03            806         -              Normal
  04/03/2026 09 AM PDT            4.01            795         -              Normal
  04/03/2026 10 AM PDT            3.98            780         -              Normal
  04/03/2026 11 AM PDT            3.96            770         -              Normal
  04/03/2026 12 PM PDT            3.93            755         -              Normal
  04/03/2026 01 PM PDT            3.91            745         -              Normal
  04/03/2026 02 PM PDT            3.89            735         -              Normal
  04/03/2026 03 PM PDT            3.87            725         -              Normal
  04/03/2026 04 PM PDT            3.86            720         -              Normal
  04/03/2026 05 PM PDT            3.85            715         -              Normal
  04/03/2026 06 PM PDT            3.87            725         +              Normal
  04/03/2026 07 PM PDT            3.88            730         +              Normal
  04/03/2026 08 PM PDT            3.90            740         +              Normal
  04/03/2026 09 PM PDT            3.91            745         +              Normal
  04/03/2026 10 PM PDT            3.93            755         +              Normal
  04/03/2026 11 PM PDT            3.93            755         0              Normal
  04/04/2026 12 AM PDT            3.94            760         +              Normal
  04/04/2026 01 AM PDT            3.96            770         +              Normal
  04/04/2026 02 AM PDT            3.96            770         0              Normal
  04/04/2026 03 AM PDT            3.97            775         +              Normal
  04/04/2026 04 AM PDT            3.97            775         0              Normal
  04/04/2026 05 AM PDT            3.97            775         0              Normal
  04/04/2026 06 AM PDT            3.97            775         0              Normal
  04/04/2026 07 AM PDT            3.95            765         -              Normal
  04/04/2026 08 AM PDT            3.94            760         -              Normal
  04/04/2026 09 AM PDT            3.93            755         -              Normal
  04/04/2026 10 AM PDT            3.91            745         -              Normal
  04/04/2026 11 AM PDT            3.90            740         -              Normal
  04/04/2026 12 PM PDT            3.88            730         -              Normal
  04/04/2026 01 PM PDT            3.86            720         -              Normal
  04/04/2026 02 PM PDT            3.85            715         -              Normal
  04/04/2026 03 PM PDT            3.83            705         -              Normal
  04/04/2026 04 PM PDT            3.83            705         0              Normal
  04/04/2026 05 PM PDT            3.83            705         0              Normal
  04/04/2026 06 PM PDT            3.85            715         +              Normal
  04/04/2026 07 PM PDT            3.88            730         +              Normal
  04/04/2026 08 PM PDT            3.92            750         +              Normal
  04/04/2026 09 PM PDT            3.94            760         +              Normal
  04/04/2026 10 PM PDT            3.98            780         +              Normal
  04/04/2026 11 PM PDT            4.00            790         +              Normal
  04/05/2026 12 AM PDT            4.02            801         +              Normal
  04/05/2026 01 AM PDT            4.04            811         +              Normal
  04/05/2026 02 AM PDT            4.05            816         +              Normal
  04/05/2026 03 AM PDT            4.06            821         +              Normal
  04/05/2026 04 AM PDT            4.07            827         +              Normal
  04/05/2026 05 AM PDT            4.08            832         +              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.