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 17 2026 at 6:49 AM PDTNext Issuance: Mar 17 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:  03/17/2026 at 06:49 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  03/17/2026 at 03:00 AM PDT
# Maximum Observed Stage:                       4.48 Feet
# Maximum Observed Flow:                        1059 cfs
#
# Earliest Date & Time of Maximum Forecast:     03/21/2026 at 02:00 AM PDT
# Maximum Forecast Stage:                       5.32 Feet
# Maximum Forecast Flow:                        1631 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  03/12/2026 06 AM PDT            3.41            518                        Normal
  03/12/2026 07 AM PDT            3.42            522         +              Normal
  03/12/2026 08 AM PDT            3.43            526         +              Normal
  03/12/2026 09 AM PDT            3.39            510         -              Normal
  03/12/2026 10 AM PDT            3.40            514         +              Normal
  03/12/2026 11 AM PDT            3.37            502         -              Normal
  03/12/2026 12 PM PDT            3.37            502         0              Normal
  03/12/2026 01 PM PDT            3.37            502         0              Normal
  03/12/2026 02 PM PDT            3.34            490         -              Normal
  03/12/2026 03 PM PDT            3.33            486         -              Normal
  03/12/2026 04 PM PDT            3.35            494         +              Normal
  03/12/2026 05 PM PDT            3.35            494         0              Normal
  03/12/2026 06 PM PDT            3.38            506         +              Normal
  03/12/2026 07 PM PDT            3.41            518         +              Normal
  03/12/2026 08 PM PDT            3.44            531         +              Normal
  03/12/2026 09 PM PDT            3.49            551         +              Normal
  03/12/2026 10 PM PDT            3.53            568         +              Normal
  03/12/2026 11 PM PDT            3.59            594         +              Normal
  03/13/2026 12 AM PDT            3.58            590         -              Normal
  03/13/2026 01 AM PDT            3.60            599         +              Normal
  03/13/2026 02 AM PDT            3.62            608         +              Normal
  03/13/2026 03 AM PDT            3.61            603         -              Normal
  03/13/2026 04 AM PDT            3.61            603         0              Normal
  03/13/2026 05 AM PDT            3.59            594         -              Normal
  03/13/2026 06 AM PDT            3.59            594         0              Normal
  03/13/2026 07 AM PDT            3.59            594         0              Normal
  03/13/2026 08 AM PDT            3.56            581         -              Normal
  03/13/2026 09 AM PDT            3.58            590         +              Normal
  03/13/2026 10 AM PDT            3.54            573         -              Normal
  03/13/2026 11 AM PDT            3.57            586         +              Normal
  03/13/2026 12 PM PDT            3.52            564         -              Normal
  03/13/2026 01 PM PDT            3.51            560         -              Normal
  03/13/2026 02 PM PDT            3.51            560         0              Normal
  03/13/2026 03 PM PDT            3.50            556         -              Normal
  03/13/2026 04 PM PDT            3.50            556         0              Normal
  03/13/2026 05 PM PDT            3.49            551         -              Normal
  03/13/2026 06 PM PDT            3.50            556         +              Normal
  03/13/2026 07 PM PDT            3.54            573         +              Normal
  03/13/2026 08 PM PDT            3.58            590         +              Normal
  03/13/2026 09 PM PDT            3.58            590         0              Normal
  03/13/2026 10 PM PDT            3.63            612         +              Normal
  03/13/2026 11 PM PDT            3.64            617         +              Normal
  03/14/2026 12 AM PDT            3.66            626         +              Normal
  03/14/2026 01 AM PDT            3.69            639         +              Normal
  03/14/2026 02 AM PDT            3.66            626         -              Normal
  03/14/2026 03 AM PDT            3.66            626         0              Normal
  03/14/2026 04 AM PDT            3.67            630         +              Normal
  03/14/2026 05 AM PDT            3.65            621         -              Normal
  03/14/2026 06 AM PDT            3.65            621         0              Normal
  03/14/2026 07 AM PDT            3.64            617         -              Normal
  03/14/2026 08 AM PDT            3.63            612         -              Normal
  03/14/2026 09 AM PDT            3.62            608         -              Normal
  03/14/2026 10 AM PDT            3.60            599         -              Normal
  03/14/2026 11 AM PDT            3.59            594         -              Normal
  03/14/2026 12 PM PDT            3.57            586         -              Normal
  03/14/2026 01 PM PDT            3.55            577         -              Normal
  03/14/2026 02 PM PDT            3.56            581         +              Normal
  03/14/2026 03 PM PDT            3.53            568         -              Normal
  03/14/2026 04 PM PDT            3.56            581         +              Normal
  03/14/2026 05 PM PDT            3.55            577         -              Normal
  03/14/2026 06 PM PDT            3.61            603         +              Normal
  03/14/2026 07 PM PDT            3.63            612         +              Normal
  03/14/2026 08 PM PDT            3.66            626         +              Normal
  03/14/2026 09 PM PDT            3.71            649         +              Normal
  03/14/2026 10 PM PDT            3.76            672         +              Normal
  03/14/2026 11 PM PDT            3.76            672         0              Normal
  03/15/2026 12 AM PDT            3.77            677         +              Normal
  03/15/2026 01 AM PDT            3.81            696         +              Normal
  03/15/2026 02 AM PDT            3.81            696         0              Normal
  03/15/2026 03 AM PDT            3.81            696         0              Normal
  03/15/2026 04 AM PDT            3.79            686         -              Normal
  03/15/2026 05 AM PDT            3.78            681         -              Normal
  03/15/2026 06 AM PDT            3.78            681         0              Normal
  03/15/2026 07 AM PDT            3.76            672         -              Normal
  03/15/2026 08 AM PDT            3.75            667         -              Normal
  03/15/2026 09 AM PDT            3.76            672         +              Normal
  03/15/2026 10 AM PDT            3.75            667         -              Normal
  03/15/2026 11 AM PDT            3.71            649         -              Normal
  03/15/2026 12 PM PDT            3.69            639         -              Normal
  03/15/2026 01 PM PDT            3.72            653         +              Normal
  03/15/2026 02 PM PDT            3.68            635         -              Normal
  03/15/2026 03 PM PDT            3.67            630         -              Normal
  03/15/2026 04 PM PDT            3.66            626         -              Normal
  03/15/2026 05 PM PDT            3.67            630         +              Normal
  03/15/2026 06 PM PDT            3.71            649         +              Normal
  03/15/2026 07 PM PDT            3.75            667         +              Normal
  03/15/2026 08 PM PDT            3.79            686         +              Normal
  03/15/2026 09 PM PDT            3.86            720         +              Normal
  03/15/2026 10 PM PDT            3.91            745         +              Normal
  03/15/2026 11 PM PDT            3.98            780         +              Normal
  03/16/2026 12 AM PDT            3.99            785         +              Normal
  03/16/2026 01 AM PDT            4.00            790         +              Normal
  03/16/2026 02 AM PDT            4.05            816         +              Normal
  03/16/2026 03 AM PDT            4.02            801         -              Normal
  03/16/2026 04 AM PDT            4.04            811         +              Normal
  03/16/2026 05 AM PDT            4.02            801         -              Normal
  03/16/2026 06 AM PDT            4.00            790         -              Normal
  03/16/2026 07 AM PDT            3.99            785         -              Normal
  03/16/2026 08 AM PDT            3.96            770         -              Normal
  03/16/2026 09 AM PDT            3.97            775         +              Normal
  03/16/2026 10 AM PDT            3.96            770         -              Normal
  03/16/2026 11 AM PDT            3.94            760         -              Normal
  03/16/2026 12 PM PDT            3.93            755         -              Normal
  03/16/2026 01 PM PDT            3.90            740         -              Normal
  03/16/2026 02 PM PDT            3.85            715         -              Normal
  03/16/2026 03 PM PDT            3.90            740         +              Normal
  03/16/2026 04 PM PDT            3.89            735         -              Normal
  03/16/2026 05 PM PDT            3.93            755         +              Normal
  03/16/2026 06 PM PDT            3.97            775         +              Normal
  03/16/2026 07 PM PDT            4.06            821         +              Normal
  03/16/2026 08 PM PDT            4.14            864         +              Normal
  03/16/2026 09 PM PDT            4.27            936         +              Normal
  03/16/2026 10 PM PDT            4.40           1011         +              Normal
  03/16/2026 11 PM PDT            4.40           1011         0              Normal
  03/17/2026 12 AM PDT            4.43           1029         +              Normal
  03/17/2026 01 AM PDT            4.44           1035         +              Normal
  03/17/2026 02 AM PDT            4.43           1029         -              Normal
  03/17/2026 03 AM PDT            4.48           1059         +              Normal
  03/17/2026 04 AM PDT            4.45           1041         -              Normal
  03/17/2026 05 AM PDT            4.46           1047         +              Normal
  03/17/2026 06 AM PDT            4.45           1041         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  03/17/2026 07 AM PDT            4.42           1023                        Normal
  03/17/2026 08 AM PDT            4.39           1005         -              Normal
  03/17/2026 09 AM PDT            4.36            988         -              Normal
  03/17/2026 10 AM PDT            4.32            965         -              Normal
  03/17/2026 11 AM PDT            4.28            942         -              Normal
  03/17/2026 12 PM PDT            4.24            919         -              Normal
  03/17/2026 01 PM PDT            4.22            908         -              Normal
  03/17/2026 02 PM PDT            4.22            908         0              Normal
  03/17/2026 03 PM PDT            4.20            897         -              Normal
  03/17/2026 04 PM PDT            4.22            908         +              Normal
  03/17/2026 05 PM PDT            4.26            930         +              Normal
  03/17/2026 06 PM PDT            4.33            970         +              Normal
  03/17/2026 07 PM PDT            4.39           1005         +              Normal
  03/17/2026 08 PM PDT            4.45           1041         +              Normal
  03/17/2026 09 PM PDT            4.50           1071         +              Normal
  03/17/2026 10 PM PDT            4.56           1108         +              Normal
  03/17/2026 11 PM PDT            4.60           1133         +              Normal
  03/18/2026 12 AM PDT            4.63           1152         +              Normal
  03/18/2026 01 AM PDT            4.65           1165         +              Normal
  03/18/2026 02 AM PDT            4.67           1178         +              Normal
  03/18/2026 03 AM PDT            4.68           1184         +              Normal
  03/18/2026 04 AM PDT            4.70           1197         +              Normal
  03/18/2026 05 AM PDT            4.71           1204         +              Normal
  03/18/2026 06 AM PDT            4.70           1197         -              Normal
  03/18/2026 07 AM PDT            4.67           1178         -              Normal
  03/18/2026 08 AM PDT            4.63           1152         -              Normal
  03/18/2026 09 AM PDT            4.60           1133         -              Normal
  03/18/2026 10 AM PDT            4.56           1108         -              Normal
  03/18/2026 11 AM PDT            4.51           1077         -              Normal
  03/18/2026 12 PM PDT            4.46           1047         -              Normal
  03/18/2026 01 PM PDT            4.44           1035         -              Normal
  03/18/2026 02 PM PDT            4.44           1035         0              Normal
  03/18/2026 03 PM PDT            4.41           1017         -              Normal
  03/18/2026 04 PM PDT            4.44           1035         +              Normal
  03/18/2026 05 PM PDT            4.48           1059         +              Normal
  03/18/2026 06 PM PDT            4.54           1096         +              Normal
  03/18/2026 07 PM PDT            4.61           1140         +              Normal
  03/18/2026 08 PM PDT            4.67           1178         +              Normal
  03/18/2026 09 PM PDT            4.72           1210         +              Normal
  03/18/2026 10 PM PDT            4.77           1242         +              Normal
  03/18/2026 11 PM PDT            4.81           1269         +              Normal
  03/19/2026 12 AM PDT            4.83           1282         +              Normal
  03/19/2026 01 AM PDT            4.85           1295         +              Normal
  03/19/2026 02 AM PDT            4.87           1309         +              Normal
  03/19/2026 03 AM PDT            4.87           1309         0              Normal
  03/19/2026 04 AM PDT            4.89           1322         +              Normal
  03/19/2026 05 AM PDT            4.89           1322         0              Normal
  03/19/2026 06 AM PDT            4.88           1316         -              Normal
  03/19/2026 07 AM PDT            4.84           1289         -              Normal
  03/19/2026 08 AM PDT            4.80           1262         -              Normal
  03/19/2026 09 AM PDT            4.77           1242         -              Normal
  03/19/2026 10 AM PDT            4.72           1210         -              Normal
  03/19/2026 11 AM PDT            4.67           1178         -              Normal
  03/19/2026 12 PM PDT            4.62           1146         -              Normal
  03/19/2026 01 PM PDT            4.59           1127         -              Normal
  03/19/2026 02 PM PDT            4.59           1127         0              Normal
  03/19/2026 03 PM PDT            4.57           1115         -              Normal
  03/19/2026 04 PM PDT            4.59           1127         +              Normal
  03/19/2026 05 PM PDT            4.65           1165         +              Normal
  03/19/2026 06 PM PDT            4.72           1210         +              Normal
  03/19/2026 07 PM PDT            4.80           1262         +              Normal
  03/19/2026 08 PM PDT            4.88           1316         +              Normal
  03/19/2026 09 PM PDT            4.95           1363         +              Normal
  03/19/2026 10 PM PDT            5.02           1412         +              Normal
  03/19/2026 11 PM PDT            5.07           1447         +              Normal
  03/20/2026 12 AM PDT            5.11           1476         +              Normal
  03/20/2026 01 AM PDT            5.12           1483         +              Normal
  03/20/2026 02 AM PDT            5.15           1505         +              Normal
  03/20/2026 03 AM PDT            5.16           1512         +              Normal
  03/20/2026 04 AM PDT            5.18           1527         +              Normal
  03/20/2026 05 AM PDT            5.18           1527         0              Normal
  03/20/2026 06 AM PDT            5.17           1520         -              Normal
  03/20/2026 07 AM PDT            5.13           1490         -              Normal
  03/20/2026 08 AM PDT            5.09           1462         -              Normal
  03/20/2026 09 AM PDT            5.05           1433         -              Normal
  03/20/2026 10 AM PDT            5.00           1398         -              Normal
  03/20/2026 11 AM PDT            4.94           1356         -              Normal
  03/20/2026 12 PM PDT            4.89           1322         -              Normal
  03/20/2026 01 PM PDT            4.86           1302         -              Normal
  03/20/2026 02 PM PDT            4.86           1302         0              Normal
  03/20/2026 03 PM PDT            4.83           1282         -              Normal
  03/20/2026 04 PM PDT            4.86           1302         +              Normal
  03/20/2026 05 PM PDT            4.91           1336         +              Normal
  03/20/2026 06 PM PDT            4.98           1384         +              Normal
  03/20/2026 07 PM PDT            5.05           1433         +              Normal
  03/20/2026 08 PM PDT            5.11           1476         +              Normal
  03/20/2026 09 PM PDT            5.17           1520         +              Normal
  03/20/2026 10 PM PDT            5.22           1556         +              Normal
  03/20/2026 11 PM PDT            5.26           1586         +              Normal
  03/21/2026 12 AM PDT            5.29           1609         +              Normal
  03/21/2026 01 AM PDT            5.31           1624         +              Normal
  03/21/2026 02 AM PDT            5.32           1631         +              Normal
  03/21/2026 03 AM PDT            5.32           1631         0              Normal
  03/21/2026 04 AM PDT            5.31           1624         -              Normal
  03/21/2026 05 AM PDT            5.30           1616         -              Normal
  03/21/2026 06 AM PDT            5.27           1594         -              Normal
  03/21/2026 07 AM PDT            5.22           1556         -              Normal
  03/21/2026 08 AM PDT            5.17           1520         -              Normal
  03/21/2026 09 AM PDT            5.14           1498         -              Normal
  03/21/2026 10 AM PDT            5.08           1454         -              Normal
  03/21/2026 11 AM PDT            5.04           1426         -              Normal
  03/21/2026 12 PM PDT            4.97           1377         -              Normal
  03/21/2026 01 PM PDT            4.93           1350         -              Normal
  03/21/2026 02 PM PDT            4.88           1316         -              Normal
  03/21/2026 03 PM PDT            4.84           1289         -              Normal
  03/21/2026 04 PM PDT            4.82           1275         -              Normal
  03/21/2026 05 PM PDT            4.83           1282         +              Normal
  03/21/2026 06 PM PDT            4.89           1322         +              Normal
  03/21/2026 07 PM PDT            4.94           1356         +              Normal
  03/21/2026 08 PM PDT            5.02           1412         +              Normal
  03/21/2026 09 PM PDT            5.07           1447         +              Normal
  03/21/2026 10 PM PDT            5.14           1498         +              Normal
  03/21/2026 11 PM PDT            5.16           1512         +              Normal
  03/22/2026 12 AM PDT            5.18           1527         +              Normal
  03/22/2026 01 AM PDT            5.19           1534         +              Normal
  03/22/2026 02 AM PDT            5.19           1534         0              Normal
  03/22/2026 03 AM PDT            5.18           1527         -              Normal
  03/22/2026 04 AM PDT            5.17           1520         -              Normal
  03/22/2026 05 AM PDT            5.16           1512         -              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.