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 24 2026 at 7:36 AM PDTNext Issuance: Mar 24 2026 at 3:00 PM 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:  03/24/2026 at 07:36 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  03/21/2026 at 02:00 AM PDT
# Maximum Observed Stage:                       5.35 Feet
# Maximum Observed Flow:                        1654 cfs
#
# Earliest Date & Time of Maximum Forecast:     03/26/2026 at 02:00 AM PDT
# Maximum Forecast Stage:                       5.17 Feet
# Maximum Forecast Flow:                        1520 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/19/2026 07 AM PDT            4.85           1295                        Normal
  03/19/2026 08 AM PDT            4.81           1269         -              Normal
  03/19/2026 09 AM PDT            4.78           1249         -              Normal
  03/19/2026 10 AM PDT            4.77           1242         -              Normal
  03/19/2026 11 AM PDT            4.72           1210         -              Normal
  03/19/2026 12 PM PDT            4.66           1171         -              Normal
  03/19/2026 01 PM PDT            4.63           1152         -              Normal
  03/19/2026 02 PM PDT            4.60           1133         -              Normal
  03/19/2026 03 PM PDT            4.56           1108         -              Normal
  03/19/2026 04 PM PDT            4.57           1115         +              Normal
  03/19/2026 05 PM PDT            4.57           1115         0              Normal
  03/19/2026 06 PM PDT            4.62           1146         +              Normal
  03/19/2026 07 PM PDT            4.69           1191         +              Normal
  03/19/2026 08 PM PDT            4.75           1229         +              Normal
  03/19/2026 09 PM PDT            4.88           1316         +              Normal
  03/19/2026 10 PM PDT            4.93           1350         +              Normal
  03/19/2026 11 PM PDT            4.97           1377         +              Normal
  03/20/2026 12 AM PDT            5.04           1426         +              Normal
  03/20/2026 01 AM PDT            5.04           1426         0              Normal
  03/20/2026 02 AM PDT            5.03           1419         -              Normal
  03/20/2026 03 AM PDT            5.02           1412         -              Normal
  03/20/2026 04 AM PDT            5.02           1412         0              Normal
  03/20/2026 05 AM PDT            4.98           1384         -              Normal
  03/20/2026 06 AM PDT            4.95           1363         -              Normal
  03/20/2026 07 AM PDT            4.93           1350         -              Normal
  03/20/2026 08 AM PDT            4.93           1350         0              Normal
  03/20/2026 09 AM PDT            4.87           1309         -              Normal
  03/20/2026 10 AM PDT            4.84           1289         -              Normal
  03/20/2026 11 AM PDT            4.79           1256         -              Normal
  03/20/2026 12 PM PDT            4.76           1236         -              Normal
  03/20/2026 01 PM PDT            4.69           1191         -              Normal
  03/20/2026 02 PM PDT            4.71           1204         +              Normal
  03/20/2026 03 PM PDT            4.68           1184         -              Normal
  03/20/2026 04 PM PDT            4.70           1197         +              Normal
  03/20/2026 05 PM PDT            4.72           1210         +              Normal
  03/20/2026 06 PM PDT            4.82           1275         +              Normal
  03/20/2026 07 PM PDT            4.97           1377         +              Normal
  03/20/2026 08 PM PDT            5.11           1476         +              Normal
  03/20/2026 09 PM PDT            5.18           1527         +              Normal
  03/20/2026 10 PM PDT            5.30           1616         +              Normal
  03/20/2026 11 PM PDT            5.34           1647         +              Normal
  03/21/2026 12 AM PDT            5.33           1639         -              Normal
  03/21/2026 01 AM PDT            5.34           1647         +              Normal
  03/21/2026 02 AM PDT            5.35           1654         +              Normal
  03/21/2026 03 AM PDT            5.34           1647         -              Normal
  03/21/2026 04 AM PDT            5.33           1639         -              Normal
  03/21/2026 05 AM PDT            5.28           1601         -              Normal
  03/21/2026 06 AM PDT            5.28           1601         0              Normal
  03/21/2026 07 AM PDT            5.18           1527         -              Normal
  03/21/2026 08 AM PDT            5.16           1512         -              Normal
  03/21/2026 09 AM PDT            5.10           1469         -              Normal
  03/21/2026 10 AM PDT            5.06           1440         -              Normal
  03/21/2026 11 AM PDT            4.97           1377         -              Normal
  03/21/2026 12 PM PDT            4.93           1350         -              Normal
  03/21/2026 01 PM PDT            4.90           1329         -              Normal
  03/21/2026 02 PM PDT            4.84           1289         -              Normal
  03/21/2026 03 PM PDT            4.83           1282         -              Normal
  03/21/2026 04 PM PDT            4.77           1242         -              Normal
  03/21/2026 05 PM PDT            4.78           1249         +              Normal
  03/21/2026 06 PM PDT            4.81           1269         +              Normal
  03/21/2026 07 PM PDT            4.79           1256         -              Normal
  03/21/2026 08 PM PDT            4.83           1282         +              Normal
  03/21/2026 09 PM PDT            4.91           1336         +              Normal
  03/21/2026 10 PM PDT            4.97           1377         +              Normal
  03/21/2026 11 PM PDT            5.01           1405         +              Normal
  03/22/2026 12 AM PDT            5.03           1419         +              Normal
  03/22/2026 01 AM PDT            5.02           1412         -              Normal
  03/22/2026 02 AM PDT            5.00           1398         -              Normal
  03/22/2026 03 AM PDT            4.98           1384         -              Normal
  03/22/2026 04 AM PDT            4.95           1363         -              Normal
  03/22/2026 05 AM PDT            4.95           1363         0              Normal
  03/22/2026 06 AM PDT            4.91           1336         -              Normal
  03/22/2026 07 AM PDT            4.86           1302         -              Normal
  03/22/2026 08 AM PDT            4.84           1289         -              Normal
  03/22/2026 09 AM PDT            4.79           1256         -              Normal
  03/22/2026 10 AM PDT            4.80           1262         +              Normal
  03/22/2026 11 AM PDT            4.74           1223         -              Normal
  03/22/2026 12 PM PDT            4.67           1178         -              Normal
  03/22/2026 01 PM PDT            4.65           1165         -              Normal
  03/22/2026 02 PM PDT            4.64           1159         -              Normal
  03/22/2026 03 PM PDT            4.60           1133         -              Normal
  03/22/2026 04 PM PDT            4.56           1108         -              Normal
  03/22/2026 05 PM PDT            4.60           1133         +              Normal
  03/22/2026 06 PM PDT            4.62           1146         +              Normal
  03/22/2026 07 PM PDT            4.64           1159         +              Normal
  03/22/2026 08 PM PDT            4.77           1242         +              Normal
  03/22/2026 09 PM PDT            4.83           1282         +              Normal
  03/22/2026 10 PM PDT            4.92           1343         +              Normal
  03/22/2026 11 PM PDT            5.01           1405         +              Normal
  03/23/2026 12 AM PDT            5.03           1419         +              Normal
  03/23/2026 01 AM PDT            5.03           1419         0              Normal
  03/23/2026 02 AM PDT            5.06           1440         +              Normal
  03/23/2026 03 AM PDT            5.07           1447         +              Normal
  03/23/2026 04 AM PDT            5.05           1433         -              Normal
  03/23/2026 05 AM PDT            5.00           1398         -              Normal
  03/23/2026 06 AM PDT            4.97           1377         -              Normal
  03/23/2026 07 AM PDT            4.97           1377         0              Normal
  03/23/2026 08 AM PDT            4.91           1336         -              Normal
  03/23/2026 09 AM PDT            4.90           1329         -              Normal
  03/23/2026 10 AM PDT            4.86           1302         -              Normal
  03/23/2026 11 AM PDT            4.82           1275         -              Normal
  03/23/2026 12 PM PDT            4.75           1229         -              Normal
  03/23/2026 01 PM PDT            4.70           1197         -              Normal
  03/23/2026 02 PM PDT            4.63           1152         -              Normal
  03/23/2026 03 PM PDT            4.65           1165         +              Normal
  03/23/2026 04 PM PDT            4.58           1121         -              Normal
  03/23/2026 05 PM PDT            4.61           1140         +              Normal
  03/23/2026 06 PM PDT            4.63           1152         +              Normal
  03/23/2026 07 PM PDT            4.64           1159         +              Normal
  03/23/2026 08 PM PDT            4.73           1216         +              Normal
  03/23/2026 09 PM PDT            4.77           1242         +              Normal
  03/23/2026 10 PM PDT            4.83           1282         +              Normal
  03/23/2026 11 PM PDT            4.86           1302         +              Normal
  03/24/2026 12 AM PDT            4.92           1343         +              Normal
  03/24/2026 01 AM PDT            4.91           1336         -              Normal
  03/24/2026 02 AM PDT            4.88           1316         -              Normal
  03/24/2026 03 AM PDT            4.91           1336         +              Normal
  03/24/2026 04 AM PDT            4.89           1322         -              Normal
  03/24/2026 05 AM PDT            4.88           1316         -              Normal
  03/24/2026 06 AM PDT            4.86           1302         -              Normal
  03/24/2026 07 AM PDT            4.83           1282         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  03/24/2026 08 AM PDT            4.80           1262                        Normal
  03/24/2026 09 AM PDT            4.78           1249         -              Normal
  03/24/2026 10 AM PDT            4.73           1216         -              Normal
  03/24/2026 11 AM PDT            4.71           1204         -              Normal
  03/24/2026 12 PM PDT            4.67           1178         -              Normal
  03/24/2026 01 PM PDT            4.66           1171         -              Normal
  03/24/2026 02 PM PDT            4.64           1159         -              Normal
  03/24/2026 03 PM PDT            4.61           1140         -              Normal
  03/24/2026 04 PM PDT            4.62           1146         +              Normal
  03/24/2026 05 PM PDT            4.64           1159         +              Normal
  03/24/2026 06 PM PDT            4.71           1204         +              Normal
  03/24/2026 07 PM PDT            4.77           1242         +              Normal
  03/24/2026 08 PM PDT            4.86           1302         +              Normal
  03/24/2026 09 PM PDT            4.92           1343         +              Normal
  03/24/2026 10 PM PDT            5.00           1398         +              Normal
  03/24/2026 11 PM PDT            5.04           1426         +              Normal
  03/25/2026 12 AM PDT            5.07           1447         +              Normal
  03/25/2026 01 AM PDT            5.10           1469         +              Normal
  03/25/2026 02 AM PDT            5.11           1476         +              Normal
  03/25/2026 03 AM PDT            5.12           1483         +              Normal
  03/25/2026 04 AM PDT            5.12           1483         0              Normal
  03/25/2026 05 AM PDT            5.12           1483         0              Normal
  03/25/2026 06 AM PDT            5.10           1469         -              Normal
  03/25/2026 07 AM PDT            5.06           1440         -              Normal
  03/25/2026 08 AM PDT            5.02           1412         -              Normal
  03/25/2026 09 AM PDT            5.00           1398         -              Normal
  03/25/2026 10 AM PDT            4.95           1363         -              Normal
  03/25/2026 11 AM PDT            4.92           1343         -              Normal
  03/25/2026 12 PM PDT            4.87           1309         -              Normal
  03/25/2026 01 PM PDT            4.84           1289         -              Normal
  03/25/2026 02 PM PDT            4.81           1269         -              Normal
  03/25/2026 03 PM PDT            4.78           1249         -              Normal
  03/25/2026 04 PM PDT            4.77           1242         -              Normal
  03/25/2026 05 PM PDT            4.79           1256         +              Normal
  03/25/2026 06 PM PDT            4.85           1295         +              Normal
  03/25/2026 07 PM PDT            4.91           1336         +              Normal
  03/25/2026 08 PM PDT            4.99           1391         +              Normal
  03/25/2026 09 PM PDT            5.04           1426         +              Normal
  03/25/2026 10 PM PDT            5.11           1476         +              Normal
  03/25/2026 11 PM PDT            5.13           1490         +              Normal
  03/26/2026 12 AM PDT            5.15           1505         +              Normal
  03/26/2026 01 AM PDT            5.16           1512         +              Normal
  03/26/2026 02 AM PDT            5.17           1520         +              Normal
  03/26/2026 03 AM PDT            5.16           1512         -              Normal
  03/26/2026 04 AM PDT            5.15           1505         -              Normal
  03/26/2026 05 AM PDT            5.14           1498         -              Normal
  03/26/2026 06 AM PDT            5.10           1469         -              Normal
  03/26/2026 07 AM PDT            5.06           1440         -              Normal
  03/26/2026 08 AM PDT            5.01           1405         -              Normal
  03/26/2026 09 AM PDT            4.97           1377         -              Normal
  03/26/2026 10 AM PDT            4.92           1343         -              Normal
  03/26/2026 11 AM PDT            4.88           1316         -              Normal
  03/26/2026 12 PM PDT            4.82           1275         -              Normal
  03/26/2026 01 PM PDT            4.79           1256         -              Normal
  03/26/2026 02 PM PDT            4.75           1229         -              Normal
  03/26/2026 03 PM PDT            4.72           1210         -              Normal
  03/26/2026 04 PM PDT            4.71           1204         -              Normal
  03/26/2026 05 PM PDT            4.72           1210         +              Normal
  03/26/2026 06 PM PDT            4.78           1249         +              Normal
  03/26/2026 07 PM PDT            4.83           1282         +              Normal
  03/26/2026 08 PM PDT            4.91           1336         +              Normal
  03/26/2026 09 PM PDT            4.96           1370         +              Normal
  03/26/2026 10 PM PDT            5.02           1412         +              Normal
  03/26/2026 11 PM PDT            5.05           1433         +              Normal
  03/27/2026 12 AM PDT            5.06           1440         +              Normal
  03/27/2026 01 AM PDT            5.08           1454         +              Normal
  03/27/2026 02 AM PDT            5.08           1454         0              Normal
  03/27/2026 03 AM PDT            5.08           1454         0              Normal
  03/27/2026 04 AM PDT            5.07           1447         -              Normal
  03/27/2026 05 AM PDT            5.07           1447         0              Normal
  03/27/2026 06 AM PDT            5.04           1426         -              Normal
  03/27/2026 07 AM PDT            5.00           1398         -              Normal
  03/27/2026 08 AM PDT            4.96           1370         -              Normal
  03/27/2026 09 AM PDT            4.93           1350         -              Normal
  03/27/2026 10 AM PDT            4.87           1309         -              Normal
  03/27/2026 11 AM PDT            4.84           1289         -              Normal
  03/27/2026 12 PM PDT            4.79           1256         -              Normal
  03/27/2026 01 PM PDT            4.76           1236         -              Normal
  03/27/2026 02 PM PDT            4.73           1216         -              Normal
  03/27/2026 03 PM PDT            4.70           1197         -              Normal
  03/27/2026 04 PM PDT            4.70           1197         0              Normal
  03/27/2026 05 PM PDT            4.71           1204         +              Normal
  03/27/2026 06 PM PDT            4.77           1242         +              Normal
  03/27/2026 07 PM PDT            4.82           1275         +              Normal
  03/27/2026 08 PM PDT            4.89           1322         +              Normal
  03/27/2026 09 PM PDT            4.95           1363         +              Normal
  03/27/2026 10 PM PDT            5.01           1405         +              Normal
  03/27/2026 11 PM PDT            5.04           1426         +              Normal
  03/28/2026 12 AM PDT            5.05           1433         +              Normal
  03/28/2026 01 AM PDT            5.07           1447         +              Normal
  03/28/2026 02 AM PDT            5.08           1454         +              Normal
  03/28/2026 03 AM PDT            5.07           1447         -              Normal
  03/28/2026 04 AM PDT            5.07           1447         0              Normal
  03/28/2026 05 AM PDT            5.06           1440         -              Normal
  03/28/2026 06 AM PDT            5.03           1419         -              Normal
  03/28/2026 07 AM PDT            4.99           1391         -              Normal
  03/28/2026 08 AM PDT            4.95           1363         -              Normal
  03/28/2026 09 AM PDT            4.92           1343         -              Normal
  03/28/2026 10 AM PDT            4.87           1309         -              Normal
  03/28/2026 11 AM PDT            4.83           1282         -              Normal
  03/28/2026 12 PM PDT            4.78           1249         -              Normal
  03/28/2026 01 PM PDT            4.75           1229         -              Normal
  03/28/2026 02 PM PDT            4.72           1210         -              Normal
  03/28/2026 03 PM PDT            4.68           1184         -              Normal
  03/28/2026 04 PM PDT            4.68           1184         0              Normal
  03/28/2026 05 PM PDT            4.69           1191         +              Normal
  03/28/2026 06 PM PDT            4.74           1223         +              Normal
  03/28/2026 07 PM PDT            4.79           1256         +              Normal
  03/28/2026 08 PM PDT            4.86           1302         +              Normal
  03/28/2026 09 PM PDT            4.91           1336         +              Normal
  03/28/2026 10 PM PDT            4.96           1370         +              Normal
  03/28/2026 11 PM PDT            4.99           1391         +              Normal
  03/29/2026 12 AM PDT            5.00           1398         +              Normal
  03/29/2026 01 AM PDT            5.01           1405         +              Normal
  03/29/2026 02 AM PDT            5.01           1405         0              Normal
  03/29/2026 03 AM PDT            5.00           1398         -              Normal
  03/29/2026 04 AM PDT            5.00           1398         0              Normal
  03/29/2026 05 AM PDT            4.99           1391         -              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.