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: Apr 25 2026 at 8:34 AM PDTNext Issuance: Apr 26 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:  04/25/2026 at 08:34 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/24/2026 at 12:00 AM PDT
# Maximum Observed Stage:                       3.89 Feet
# Maximum Observed Flow:                        735 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/30/2026 at 05:00 AM PDT
# Maximum Forecast Stage:                       4.26 Feet
# Maximum Forecast Flow:                        930 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/20/2026 08 AM PDT            3.65            621                        Normal
  04/20/2026 09 AM PDT            3.66            626         +              Normal
  04/20/2026 10 AM PDT            3.62            608         -              Normal
  04/20/2026 11 AM PDT            3.63            612         +              Normal
  04/20/2026 12 PM PDT            3.61            603         -              Normal
  04/20/2026 01 PM PDT            3.62            608         +              Normal
  04/20/2026 02 PM PDT            3.61            603         -              Normal
  04/20/2026 03 PM PDT            3.58            590         -              Normal
  04/20/2026 04 PM PDT            3.55            577         -              Normal
  04/20/2026 05 PM PDT            3.54            573         -              Normal
  04/20/2026 06 PM PDT            3.54            573         0              Normal
  04/20/2026 07 PM PDT            3.52            564         -              Normal
  04/20/2026 08 PM PDT            3.52            564         0              Normal
  04/20/2026 09 PM PDT            3.52            564         0              Normal
  04/20/2026 10 PM PDT            3.51            560         -              Normal
  04/20/2026 11 PM PDT            3.57            586         +              Normal
  04/21/2026 12 AM PDT            3.57            586         0              Normal
  04/21/2026 01 AM PDT            3.54            573         -              Normal
  04/21/2026 02 AM PDT            3.58            590         +              Normal
  04/21/2026 03 AM PDT            3.57            586         -              Normal
  04/21/2026 04 AM PDT            3.56            581         -              Normal
  04/21/2026 05 AM PDT            3.58            590         +              Normal
  04/21/2026 06 AM PDT            3.59            594         +              Normal
  04/21/2026 07 AM PDT            3.60            599         +              Normal
  04/21/2026 08 AM PDT            3.61            603         +              Normal
  04/21/2026 09 AM PDT            3.55            577         -              Normal
  04/21/2026 10 AM PDT            3.56            581         +              Normal
  04/21/2026 11 AM PDT            3.59            594         +              Normal
  04/21/2026 12 PM PDT            3.59            594         0              Normal
  04/21/2026 01 PM PDT            3.61            603         +              Normal
  04/21/2026 02 PM PDT            3.62            608         +              Normal
  04/21/2026 03 PM PDT            3.66            626         +              Normal
  04/21/2026 04 PM PDT            3.67            630         +              Normal
  04/21/2026 05 PM PDT            3.71            649         +              Normal
  04/21/2026 06 PM PDT            3.71            649         0              Normal
  04/21/2026 07 PM PDT            3.70            644         -              Normal
  04/21/2026 08 PM PDT            3.70            644         0              Normal
  04/21/2026 09 PM PDT            3.69            639         -              Normal
  04/21/2026 10 PM PDT            3.67            630         -              Normal
  04/21/2026 11 PM PDT            3.64            617         -              Normal
  04/22/2026 12 AM PDT            3.62            608         -              Normal
  04/22/2026 01 AM PDT            3.62            608         0              Normal
  04/22/2026 02 AM PDT            3.60            599         -              Normal
  04/22/2026 03 AM PDT            3.61            603         +              Normal
  04/22/2026 04 AM PDT            3.61            603         0              Normal
  04/22/2026 05 AM PDT            3.62            608         +              Normal
  04/22/2026 06 AM PDT            3.61            603         -              Normal
  04/22/2026 07 AM PDT            3.62            608         +              Normal
  04/22/2026 08 AM PDT            3.58            590         -              Normal
  04/22/2026 09 AM PDT            3.61            603         +              Normal
  04/22/2026 10 AM PDT            3.60            599         -              Normal
  04/22/2026 11 AM PDT            3.60            599         0              Normal
  04/22/2026 12 PM PDT            3.63            612         +              Normal
  04/22/2026 01 PM PDT            3.66            626         +              Normal
  04/22/2026 02 PM PDT            3.69            639         +              Normal
  04/22/2026 03 PM PDT            3.72            653         +              Normal
  04/22/2026 04 PM PDT            3.77            677         +              Normal
  04/22/2026 05 PM PDT            3.79            686         +              Normal
  04/22/2026 06 PM PDT            3.78            681         -              Normal
  04/22/2026 07 PM PDT            3.81            696         +              Normal
  04/22/2026 08 PM PDT            3.79            686         -              Normal
  04/22/2026 09 PM PDT            3.81            696         +              Normal
  04/22/2026 10 PM PDT            3.80            691         -              Normal
  04/22/2026 11 PM PDT            3.78            681         -              Normal
  04/23/2026 12 AM PDT            3.73            658         -              Normal
  04/23/2026 01 AM PDT            3.73            658         0              Normal
  04/23/2026 02 AM PDT            3.68            635         -              Normal
  04/23/2026 03 AM PDT            3.68            635         0              Normal
  04/23/2026 04 AM PDT            3.63            612         -              Normal
  04/23/2026 05 AM PDT            3.60            599         -              Normal
  04/23/2026 06 AM PDT            3.57            586         -              Normal
  04/23/2026 07 AM PDT            3.54            573         -              Normal
  04/23/2026 08 AM PDT            3.51            560         -              Normal
  04/23/2026 09 AM PDT            3.47            543         -              Normal
  04/23/2026 10 AM PDT            3.45            535         -              Normal
  04/23/2026 11 AM PDT            3.43            526         -              Normal
  04/23/2026 12 PM PDT            3.42            522         -              Normal
  04/23/2026 01 PM PDT            3.44            531         +              Normal
  04/23/2026 02 PM PDT            3.45            535         +              Normal
  04/23/2026 03 PM PDT            3.50            556         +              Normal
  04/23/2026 04 PM PDT            3.54            573         +              Normal
  04/23/2026 05 PM PDT            3.59            594         +              Normal
  04/23/2026 06 PM PDT            3.65            621         +              Normal
  04/23/2026 07 PM PDT            3.72            653         +              Normal
  04/23/2026 08 PM PDT            3.79            686         +              Normal
  04/23/2026 09 PM PDT            3.86            720         +              Normal
  04/23/2026 10 PM PDT            3.86            720         0              Normal
  04/23/2026 11 PM PDT            3.89            735         +              Normal
  04/24/2026 12 AM PDT            3.89            735         0              Normal
  04/24/2026 01 AM PDT            3.88            730         -              Normal
  04/24/2026 02 AM PDT            3.86            720         -              Normal
  04/24/2026 03 AM PDT            3.82            700         -              Normal
  04/24/2026 04 AM PDT            3.80            691         -              Normal
  04/24/2026 05 AM PDT            3.79            686         -              Normal
  04/24/2026 06 AM PDT            3.76            672         -              Normal
  04/24/2026 07 AM PDT            3.74            663         -              Normal
  04/24/2026 08 AM PDT            3.71            649         -              Normal
  04/24/2026 09 AM PDT            3.70            644         -              Normal
  04/24/2026 10 AM PDT            3.68            635         -              Normal
  04/24/2026 11 AM PDT            3.68            635         0              Normal
  04/24/2026 12 PM PDT            3.63            612         -              Normal
  04/24/2026 01 PM PDT            3.63            612         0              Normal
  04/24/2026 02 PM PDT            3.62            608         -              Normal
  04/24/2026 03 PM PDT            3.65            621         +              Normal
  04/24/2026 04 PM PDT            3.63            612         -              Normal
  04/24/2026 05 PM PDT            3.63            612         0              Normal
  04/24/2026 06 PM PDT            3.66            626         +              Normal
  04/24/2026 07 PM PDT            3.77            677         +              Normal
  04/24/2026 08 PM PDT            3.82            700         +              Normal
  04/24/2026 09 PM PDT            3.83            705         +              Normal
  04/24/2026 10 PM PDT            3.81            696         -              Normal
  04/24/2026 11 PM PDT            3.81            696         0              Normal
  04/25/2026 12 AM PDT            3.79            686         -              Normal
  04/25/2026 01 AM PDT            3.79            686         0              Normal
  04/25/2026 02 AM PDT            3.73            658         -              Normal
  04/25/2026 03 AM PDT            3.72            653         -              Normal
  04/25/2026 04 AM PDT            3.70            644         -              Normal
  04/25/2026 05 AM PDT            3.70            644         0              Normal
  04/25/2026 06 AM PDT            3.68            635         -              Normal
  04/25/2026 07 AM PDT            3.66            626         -              Normal
  04/25/2026 08 AM PDT            3.65            621         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/25/2026 09 AM PDT            3.63            612                        Normal
  04/25/2026 10 AM PDT            3.61            603         -              Normal
  04/25/2026 11 AM PDT            3.60            599         -              Normal
  04/25/2026 12 PM PDT            3.65            621         +              Normal
  04/25/2026 01 PM PDT            3.70            644         +              Normal
  04/25/2026 02 PM PDT            3.75            667         +              Normal
  04/25/2026 03 PM PDT            3.80            691         +              Normal
  04/25/2026 04 PM PDT            3.86            720         +              Normal
  04/25/2026 05 PM PDT            3.93            755         +              Normal
  04/25/2026 06 PM PDT            3.99            785         +              Normal
  04/25/2026 07 PM PDT            4.04            811         +              Normal
  04/25/2026 08 PM PDT            4.10            843         +              Normal
  04/25/2026 09 PM PDT            4.14            864         +              Normal
  04/25/2026 10 PM PDT            4.19            891         +              Normal
  04/25/2026 11 PM PDT            4.23            914         +              Normal
  04/26/2026 12 AM PDT            4.21            903         -              Normal
  04/26/2026 01 AM PDT            4.20            897         -              Normal
  04/26/2026 02 AM PDT            4.18            886         -              Normal
  04/26/2026 03 AM PDT            4.16            875         -              Normal
  04/26/2026 04 AM PDT            4.14            864         -              Normal
  04/26/2026 05 AM PDT            4.12            853         -              Normal
  04/26/2026 06 AM PDT            4.09            837         -              Normal
  04/26/2026 07 AM PDT            4.06            821         -              Normal
  04/26/2026 08 AM PDT            4.02            801         -              Normal
  04/26/2026 09 AM PDT            3.99            785         -              Normal
  04/26/2026 10 AM PDT            3.96            770         -              Normal
  04/26/2026 11 AM PDT            3.92            750         -              Normal
  04/26/2026 12 PM PDT            3.90            740         -              Normal
  04/26/2026 01 PM PDT            3.88            730         -              Normal
  04/26/2026 02 PM PDT            3.85            715         -              Normal
  04/26/2026 03 PM PDT            3.83            705         -              Normal
  04/26/2026 04 PM PDT            3.81            696         -              Normal
  04/26/2026 05 PM PDT            3.79            686         -              Normal
  04/26/2026 06 PM PDT            3.77            677         -              Normal
  04/26/2026 07 PM PDT            3.76            672         -              Normal
  04/26/2026 08 PM PDT            3.74            663         -              Normal
  04/26/2026 09 PM PDT            3.73            658         -              Normal
  04/26/2026 10 PM PDT            3.71            649         -              Normal
  04/26/2026 11 PM PDT            3.69            639         -              Normal
  04/27/2026 12 AM PDT            3.68            635         -              Normal
  04/27/2026 01 AM PDT            3.66            626         -              Normal
  04/27/2026 02 AM PDT            3.64            617         -              Normal
  04/27/2026 03 AM PDT            3.62            608         -              Normal
  04/27/2026 04 AM PDT            3.60            599         -              Normal
  04/27/2026 05 AM PDT            3.58            590         -              Normal
  04/27/2026 06 AM PDT            3.56            581         -              Normal
  04/27/2026 07 AM PDT            3.54            573         -              Normal
  04/27/2026 08 AM PDT            3.52            564         -              Normal
  04/27/2026 09 AM PDT            3.50            556         -              Normal
  04/27/2026 10 AM PDT            3.48            547         -              Normal
  04/27/2026 11 AM PDT            3.46            539         -              Normal
  04/27/2026 12 PM PDT            3.44            531         -              Normal
  04/27/2026 01 PM PDT            3.43            526         -              Normal
  04/27/2026 02 PM PDT            3.42            522         -              Normal
  04/27/2026 03 PM PDT            3.40            514         -              Normal
  04/27/2026 04 PM PDT            3.39            510         -              Normal
  04/27/2026 05 PM PDT            3.39            510         0              Normal
  04/27/2026 06 PM PDT            3.40            514         +              Normal
  04/27/2026 07 PM PDT            3.41            518         +              Normal
  04/27/2026 08 PM PDT            3.42            522         +              Normal
  04/27/2026 09 PM PDT            3.43            526         +              Normal
  04/27/2026 10 PM PDT            3.45            535         +              Normal
  04/27/2026 11 PM PDT            3.45            535         0              Normal
  04/28/2026 12 AM PDT            3.46            539         +              Normal
  04/28/2026 01 AM PDT            3.46            539         0              Normal
  04/28/2026 02 AM PDT            3.46            539         0              Normal
  04/28/2026 03 AM PDT            3.46            539         0              Normal
  04/28/2026 04 AM PDT            3.45            535         -              Normal
  04/28/2026 05 AM PDT            3.45            535         0              Normal
  04/28/2026 06 AM PDT            3.44            531         -              Normal
  04/28/2026 07 AM PDT            3.43            526         -              Normal
  04/28/2026 08 AM PDT            3.41            518         -              Normal
  04/28/2026 09 AM PDT            3.40            514         -              Normal
  04/28/2026 10 AM PDT            3.38            506         -              Normal
  04/28/2026 11 AM PDT            3.36            498         -              Normal
  04/28/2026 12 PM PDT            3.35            494         -              Normal
  04/28/2026 01 PM PDT            3.33            486         -              Normal
  04/28/2026 02 PM PDT            3.32            482         -              Normal
  04/28/2026 03 PM PDT            3.31            478         -              Normal
  04/28/2026 04 PM PDT            3.30            474         -              Normal
  04/28/2026 05 PM PDT            3.31            478         +              Normal
  04/28/2026 06 PM PDT            3.34            490         +              Normal
  04/28/2026 07 PM PDT            3.38            506         +              Normal
  04/28/2026 08 PM PDT            3.43            526         +              Normal
  04/28/2026 09 PM PDT            3.47            543         +              Normal
  04/28/2026 10 PM PDT            3.51            560         +              Normal
  04/28/2026 11 PM PDT            3.54            573         +              Normal
  04/29/2026 12 AM PDT            3.58            590         +              Normal
  04/29/2026 01 AM PDT            3.61            603         +              Normal
  04/29/2026 02 AM PDT            3.64            617         +              Normal
  04/29/2026 03 AM PDT            3.67            630         +              Normal
  04/29/2026 04 AM PDT            3.69            639         +              Normal
  04/29/2026 05 AM PDT            3.71            649         +              Normal
  04/29/2026 06 AM PDT            3.71            649         0              Normal
  04/29/2026 07 AM PDT            3.70            644         -              Normal
  04/29/2026 08 AM PDT            3.69            639         -              Normal
  04/29/2026 09 AM PDT            3.68            635         -              Normal
  04/29/2026 10 AM PDT            3.66            626         -              Normal
  04/29/2026 11 AM PDT            3.66            626         0              Normal
  04/29/2026 12 PM PDT            3.63            612         -              Normal
  04/29/2026 01 PM PDT            3.62            608         -              Normal
  04/29/2026 02 PM PDT            3.60            599         -              Normal
  04/29/2026 03 PM PDT            3.58            590         -              Normal
  04/29/2026 04 PM PDT            3.58            590         0              Normal
  04/29/2026 05 PM PDT            3.60            599         +              Normal
  04/29/2026 06 PM PDT            3.67            630         +              Normal
  04/29/2026 07 PM PDT            3.75            667         +              Normal
  04/29/2026 08 PM PDT            3.85            715         +              Normal
  04/29/2026 09 PM PDT            3.93            755         +              Normal
  04/29/2026 10 PM PDT            4.02            801         +              Normal
  04/29/2026 11 PM PDT            4.08            832         +              Normal
  04/30/2026 12 AM PDT            4.12            853         +              Normal
  04/30/2026 01 AM PDT            4.16            875         +              Normal
  04/30/2026 02 AM PDT            4.20            897         +              Normal
  04/30/2026 03 AM PDT            4.22            908         +              Normal
  04/30/2026 04 AM PDT            4.24            919         +              Normal
  04/30/2026 05 AM PDT            4.26            930         +              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.