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 08 2026 at 7:58 AM PDTNext Issuance: Apr 08 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:  04/08/2026 at 07:58 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/08/2026 at 04:00 AM PDT
# Maximum Observed Stage:                       3.96 Feet
# Maximum Observed Flow:                        770 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/11/2026 at 05:00 AM PDT
# Maximum Forecast Stage:                       4.36 Feet
# Maximum Forecast Flow:                        988 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/03/2026 07 AM PDT            3.62            608                        Normal
  04/03/2026 08 AM PDT            3.59            594         -              Normal
  04/03/2026 09 AM PDT            3.57            586         -              Normal
  04/03/2026 10 AM PDT            3.57            586         0              Normal
  04/03/2026 11 AM PDT            3.56            581         -              Normal
  04/03/2026 12 PM PDT            3.54            573         -              Normal
  04/03/2026 01 PM PDT            3.54            573         0              Normal
  04/03/2026 02 PM PDT            3.50            556         -              Normal
  04/03/2026 03 PM PDT            3.52            564         +              Normal
  04/03/2026 04 PM PDT            3.52            564         0              Normal
  04/03/2026 05 PM PDT            3.54            573         +              Normal
  04/03/2026 06 PM PDT            3.50            556         -              Normal
  04/03/2026 07 PM PDT            3.49            551         -              Normal
  04/03/2026 08 PM PDT            3.53            568         +              Normal
  04/03/2026 09 PM PDT            3.52            564         -              Normal
  04/03/2026 10 PM PDT            3.54            573         +              Normal
  04/03/2026 11 PM PDT            3.57            586         +              Normal
  04/04/2026 12 AM PDT            3.61            603         +              Normal
  04/04/2026 01 AM PDT            3.58            590         -              Normal
  04/04/2026 02 AM PDT            3.60            599         +              Normal
  04/04/2026 03 AM PDT            3.61            603         +              Normal
  04/04/2026 04 AM PDT            3.59            594         -              Normal
  04/04/2026 05 AM PDT            3.58            590         -              Normal
  04/04/2026 06 AM PDT            3.58            590         0              Normal
  04/04/2026 07 AM PDT            3.60            599         +              Normal
  04/04/2026 08 AM PDT            3.60            599         0              Normal
  04/04/2026 09 AM PDT            3.57            586         -              Normal
  04/04/2026 10 AM PDT            3.57            586         0              Normal
  04/04/2026 11 AM PDT            3.54            573         -              Normal
  04/04/2026 12 PM PDT            3.53            568         -              Normal
  04/04/2026 01 PM PDT            3.53            568         0              Normal
  04/04/2026 02 PM PDT            3.51            560         -              Normal
  04/04/2026 03 PM PDT            3.48            547         -              Normal
  04/04/2026 04 PM PDT            3.47            543         -              Normal
  04/04/2026 05 PM PDT            3.50            556         +              Normal
  04/04/2026 06 PM PDT            3.48            547         -              Normal
  04/04/2026 07 PM PDT            3.46            539         -              Normal
  04/04/2026 08 PM PDT            3.52            564         +              Normal
  04/04/2026 09 PM PDT            3.52            564         0              Normal
  04/04/2026 10 PM PDT            3.55            577         +              Normal
  04/04/2026 11 PM PDT            3.60            599         +              Normal
  04/05/2026 12 AM PDT            3.65            621         +              Normal
  04/05/2026 01 AM PDT            3.66            626         +              Normal
  04/05/2026 02 AM PDT            3.66            626         0              Normal
  04/05/2026 03 AM PDT            3.66            626         0              Normal
  04/05/2026 04 AM PDT            3.66            626         0              Normal
  04/05/2026 05 AM PDT            3.67            630         +              Normal
  04/05/2026 06 AM PDT            3.64            617         -              Normal
  04/05/2026 07 AM PDT            3.65            621         +              Normal
  04/05/2026 08 AM PDT            3.63            612         -              Normal
  04/05/2026 09 AM PDT            3.61            603         -              Normal
  04/05/2026 10 AM PDT            3.62            608         +              Normal
  04/05/2026 11 AM PDT            3.61            603         -              Normal
  04/05/2026 12 PM PDT            3.57            586         -              Normal
  04/05/2026 01 PM PDT            3.55            577         -              Normal
  04/05/2026 02 PM PDT            3.57            586         +              Normal
  04/05/2026 03 PM PDT            3.55            577         -              Normal
  04/05/2026 04 PM PDT            3.52            564         -              Normal
  04/05/2026 05 PM PDT            3.53            568         +              Normal
  04/05/2026 06 PM PDT            3.52            564         -              Normal
  04/05/2026 07 PM PDT            3.50            556         -              Normal
  04/05/2026 08 PM PDT            3.53            568         +              Normal
  04/05/2026 09 PM PDT            3.55            577         +              Normal
  04/05/2026 10 PM PDT            3.60            599         +              Normal
  04/05/2026 11 PM PDT            3.63            612         +              Normal
  04/06/2026 12 AM PDT            3.65            621         +              Normal
  04/06/2026 01 AM PDT            3.68            635         +              Normal
  04/06/2026 02 AM PDT            3.68            635         0              Normal
  04/06/2026 03 AM PDT            3.70            644         +              Normal
  04/06/2026 04 AM PDT            3.70            644         0              Normal
  04/06/2026 05 AM PDT            3.69            639         -              Normal
  04/06/2026 06 AM PDT            3.69            639         0              Normal
  04/06/2026 07 AM PDT            3.69            639         0              Normal
  04/06/2026 08 AM PDT            3.67            630         -              Normal
  04/06/2026 09 AM PDT            3.68            635         +              Normal
  04/06/2026 10 AM PDT            3.68            635         0              Normal
  04/06/2026 11 AM PDT            3.67            630         -              Normal
  04/06/2026 12 PM PDT            3.69            639         +              Normal
  04/06/2026 01 PM PDT            3.64            617         -              Normal
  04/06/2026 02 PM PDT            3.64            617         0              Normal
  04/06/2026 03 PM PDT            3.62            608         -              Normal
  04/06/2026 04 PM PDT            3.59            594         -              Normal
  04/06/2026 05 PM PDT            3.59            594         0              Normal
  04/06/2026 06 PM PDT            3.58            590         -              Normal
  04/06/2026 07 PM PDT            3.57            586         -              Normal
  04/06/2026 08 PM PDT            3.58            590         +              Normal
  04/06/2026 09 PM PDT            3.65            621         +              Normal
  04/06/2026 10 PM PDT            3.66            626         +              Normal
  04/06/2026 11 PM PDT            3.71            649         +              Normal
  04/07/2026 12 AM PDT            3.76            672         +              Normal
  04/07/2026 01 AM PDT            3.82            700         +              Normal
  04/07/2026 02 AM PDT            3.83            705         +              Normal
  04/07/2026 03 AM PDT            3.82            700         -              Normal
  04/07/2026 04 AM PDT            3.83            705         +              Normal
  04/07/2026 05 AM PDT            3.83            705         0              Normal
  04/07/2026 06 AM PDT            3.82            700         -              Normal
  04/07/2026 07 AM PDT            3.84            710         +              Normal
  04/07/2026 08 AM PDT            3.81            696         -              Normal
  04/07/2026 09 AM PDT            3.82            700         +              Normal
  04/07/2026 10 AM PDT            3.81            696         -              Normal
  04/07/2026 11 AM PDT            3.78            681         -              Normal
  04/07/2026 12 PM PDT            3.77            677         -              Normal
  04/07/2026 01 PM PDT            3.76            672         -              Normal
  04/07/2026 02 PM PDT            3.74            663         -              Normal
  04/07/2026 03 PM PDT            3.76            672         +              Normal
  04/07/2026 04 PM PDT            3.70            644         -              Normal
  04/07/2026 05 PM PDT            3.70            644         0              Normal
  04/07/2026 06 PM PDT            3.67            630         -              Normal
  04/07/2026 07 PM PDT            3.69            639         +              Normal
  04/07/2026 08 PM PDT            3.68            635         -              Normal
  04/07/2026 09 PM PDT            3.70            644         +              Normal
  04/07/2026 10 PM PDT            3.79            686         +              Normal
  04/07/2026 11 PM PDT            3.85            715         +              Normal
  04/08/2026 12 AM PDT            3.89            735         +              Normal
  04/08/2026 01 AM PDT            3.95            765         +              Normal
  04/08/2026 02 AM PDT            3.95            765         0              Normal
  04/08/2026 03 AM PDT            3.96            770         +              Normal
  04/08/2026 04 AM PDT            3.96            770         0              Normal
  04/08/2026 05 AM PDT            3.94            760         -              Normal
  04/08/2026 06 AM PDT            3.93            755         -              Normal
  04/08/2026 07 AM PDT            3.90            740         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/08/2026 08 AM PDT            3.88            730                        Normal
  04/08/2026 09 AM PDT            3.87            725         -              Normal
  04/08/2026 10 AM PDT            3.84            710         -              Normal
  04/08/2026 11 AM PDT            3.83            705         -              Normal
  04/08/2026 12 PM PDT            3.79            686         -              Normal
  04/08/2026 01 PM PDT            3.77            677         -              Normal
  04/08/2026 02 PM PDT            3.75            667         -              Normal
  04/08/2026 03 PM PDT            3.73            658         -              Normal
  04/08/2026 04 PM PDT            3.72            653         -              Normal
  04/08/2026 05 PM PDT            3.73            658         +              Normal
  04/08/2026 06 PM PDT            3.76            672         +              Normal
  04/08/2026 07 PM PDT            3.79            686         +              Normal
  04/08/2026 08 PM PDT            3.84            710         +              Normal
  04/08/2026 09 PM PDT            3.87            725         +              Normal
  04/08/2026 10 PM PDT            3.90            740         +              Normal
  04/08/2026 11 PM PDT            3.92            750         +              Normal
  04/09/2026 12 AM PDT            3.96            770         +              Normal
  04/09/2026 01 AM PDT            3.99            785         +              Normal
  04/09/2026 02 AM PDT            4.01            795         +              Normal
  04/09/2026 03 AM PDT            4.03            806         +              Normal
  04/09/2026 04 AM PDT            4.05            816         +              Normal
  04/09/2026 05 AM PDT            4.07            827         +              Normal
  04/09/2026 06 AM PDT            4.03            806         -              Normal
  04/09/2026 07 AM PDT            3.99            785         -              Normal
  04/09/2026 08 AM PDT            3.95            765         -              Normal
  04/09/2026 09 AM PDT            3.92            750         -              Normal
  04/09/2026 10 AM PDT            3.87            725         -              Normal
  04/09/2026 11 AM PDT            3.84            710         -              Normal
  04/09/2026 12 PM PDT            3.81            696         -              Normal
  04/09/2026 01 PM PDT            3.78            681         -              Normal
  04/09/2026 02 PM PDT            3.76            672         -              Normal
  04/09/2026 03 PM PDT            3.74            663         -              Normal
  04/09/2026 04 PM PDT            3.73            658         -              Normal
  04/09/2026 05 PM PDT            3.73            658         0              Normal
  04/09/2026 06 PM PDT            3.76            672         +              Normal
  04/09/2026 07 PM PDT            3.78            681         +              Normal
  04/09/2026 08 PM PDT            3.81            696         +              Normal
  04/09/2026 09 PM PDT            3.84            710         +              Normal
  04/09/2026 10 PM PDT            3.86            720         +              Normal
  04/09/2026 11 PM PDT            3.87            725         +              Normal
  04/10/2026 12 AM PDT            3.88            730         +              Normal
  04/10/2026 01 AM PDT            3.89            735         +              Normal
  04/10/2026 02 AM PDT            3.89            735         0              Normal
  04/10/2026 03 AM PDT            3.89            735         0              Normal
  04/10/2026 04 AM PDT            3.88            730         -              Normal
  04/10/2026 05 AM PDT            3.88            730         0              Normal
  04/10/2026 06 AM PDT            3.87            725         -              Normal
  04/10/2026 07 AM PDT            3.85            715         -              Normal
  04/10/2026 08 AM PDT            3.83            705         -              Normal
  04/10/2026 09 AM PDT            3.82            700         -              Normal
  04/10/2026 10 AM PDT            3.79            686         -              Normal
  04/10/2026 11 AM PDT            3.78            681         -              Normal
  04/10/2026 12 PM PDT            3.76            672         -              Normal
  04/10/2026 01 PM PDT            3.75            667         -              Normal
  04/10/2026 02 PM PDT            3.74            663         -              Normal
  04/10/2026 03 PM PDT            3.72            653         -              Normal
  04/10/2026 04 PM PDT            3.72            653         0              Normal
  04/10/2026 05 PM PDT            3.72            653         0              Normal
  04/10/2026 06 PM PDT            3.80            691         +              Normal
  04/10/2026 07 PM PDT            3.88            730         +              Normal
  04/10/2026 08 PM PDT            3.96            770         +              Normal
  04/10/2026 09 PM PDT            4.04            811         +              Normal
  04/10/2026 10 PM PDT            4.11            848         +              Normal
  04/10/2026 11 PM PDT            4.17            880         +              Normal
  04/11/2026 12 AM PDT            4.21            903         +              Normal
  04/11/2026 01 AM PDT            4.24            919         +              Normal
  04/11/2026 02 AM PDT            4.28            942         +              Normal
  04/11/2026 03 AM PDT            4.30            953         +              Normal
  04/11/2026 04 AM PDT            4.33            970         +              Normal
  04/11/2026 05 AM PDT            4.36            988         +              Normal
  04/11/2026 06 AM PDT            4.34            976         -              Normal
  04/11/2026 07 AM PDT            4.33            970         -              Normal
  04/11/2026 08 AM PDT            4.31            959         -              Normal
  04/11/2026 09 AM PDT            4.29            948         -              Normal
  04/11/2026 10 AM PDT            4.27            936         -              Normal
  04/11/2026 11 AM PDT            4.25            925         -              Normal
  04/11/2026 12 PM PDT            4.23            914         -              Normal
  04/11/2026 01 PM PDT            4.22            908         -              Normal
  04/11/2026 02 PM PDT            4.20            897         -              Normal
  04/11/2026 03 PM PDT            4.18            886         -              Normal
  04/11/2026 04 PM PDT            4.17            880         -              Normal
  04/11/2026 05 PM PDT            4.16            875         -              Normal
  04/11/2026 06 PM PDT            4.16            875         0              Normal
  04/11/2026 07 PM PDT            4.15            870         -              Normal
  04/11/2026 08 PM PDT            4.14            864         -              Normal
  04/11/2026 09 PM PDT            4.14            864         0              Normal
  04/11/2026 10 PM PDT            4.13            859         -              Normal
  04/11/2026 11 PM PDT            4.12            853         -              Normal
  04/12/2026 12 AM PDT            4.10            843         -              Normal
  04/12/2026 01 AM PDT            4.08            832         -              Normal
  04/12/2026 02 AM PDT            4.06            821         -              Normal
  04/12/2026 03 AM PDT            4.04            811         -              Normal
  04/12/2026 04 AM PDT            4.02            801         -              Normal
  04/12/2026 05 AM PDT            4.00            790         -              Normal
  04/12/2026 06 AM PDT            3.97            775         -              Normal
  04/12/2026 07 AM PDT            3.94            760         -              Normal
  04/12/2026 08 AM PDT            3.91            745         -              Normal
  04/12/2026 09 AM PDT            3.88            730         -              Normal
  04/12/2026 10 AM PDT            3.84            710         -              Normal
  04/12/2026 11 AM PDT            3.81            696         -              Normal
  04/12/2026 12 PM PDT            3.79            686         -              Normal
  04/12/2026 01 PM PDT            3.77            677         -              Normal
  04/12/2026 02 PM PDT            3.74            663         -              Normal
  04/12/2026 03 PM PDT            3.72            653         -              Normal
  04/12/2026 04 PM PDT            3.70            644         -              Normal
  04/12/2026 05 PM PDT            3.69            639         -              Normal
  04/12/2026 06 PM PDT            3.68            635         -              Normal
  04/12/2026 07 PM PDT            3.67            630         -              Normal
  04/12/2026 08 PM PDT            3.67            630         0              Normal
  04/12/2026 09 PM PDT            3.66            626         -              Normal
  04/12/2026 10 PM PDT            3.66            626         0              Normal
  04/12/2026 11 PM PDT            3.65            621         -              Normal
  04/13/2026 12 AM PDT            3.64            617         -              Normal
  04/13/2026 01 AM PDT            3.63            612         -              Normal
  04/13/2026 02 AM PDT            3.62            608         -              Normal
  04/13/2026 03 AM PDT            3.61            603         -              Normal
  04/13/2026 04 AM PDT            3.60            599         -              Normal
  04/13/2026 05 AM PDT            3.58            590         -              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.