flowchart TB
  classDef mon fill:#14324a,stroke:#4dabf7,stroke-width:2px,color:#e9ecef;
  classDef ctx fill:#2a2a2a,stroke:#6c757d,color:#adb5bd,stroke-dasharray:4 3;

  SOCAL["Southern California demand
MWD · LA Basin · AVEK"]:::ctx

  subgraph COLO["COLORADO RIVER"]
    direction TB
    UCS["Upper Colorado snowpack
SNOTEL · basin % of median"]:::mon
    PWL["Lake Powell — Glen Canyon
elev · storage · unreg inflow"]:::mon
    LEE["Lees Ferry gauge
daily flow"]:::mon
    MEA["Lake Mead — Hoover
elev · storage"]:::mon
    HAV["Lake Havasu — Parker Dam
elev · storage"]:::mon
    PHX["Phoenix / Tucson"]:::ctx
    UCS --> PWL --> LEE --> MEA --> HAV
    HAV -->|Central Arizona Project| PHX
  end
  HAV -->|Colorado River Aqueduct| SOCAL

  subgraph SWPS["STATE WATER PROJECT — Sierra / Feather"]
    direction TB
    SIE["Sierra snowpack
CDEC pillows · SWE"]:::mon
    ORO["Lake Oroville — Feather
storage · elev · inflow"]:::mon
    SHA["Shasta — CVP context
storage · elev"]:::mon
    DEL["Sacramento–San Joaquin Delta"]:::ctx
    AQ["California Aqueduct
Edmonston PP over the Tehachapis"]:::ctx
    SNL["San Luis Reservoir
storage · elev"]:::mon
    CAS["Castaic — West Branch
storage · elev"]:::mon
    SIL["Silverwood — East Branch
storage · elev"]:::mon
    PER["Lake Perris — East Branch end
storage · elev"]:::mon
    AVK["AVEK offtake
Antelope Valley"]:::ctx
    SIE --> ORO --> DEL
    SHA --> DEL
    DEL --> AQ
    AQ --> SNL
    AQ -->|West Branch| CAS
    AQ -->|East Branch · Pearblossom PP| SIL --> PER
    AQ -.-> AVK
  end
  CAS --> SOCAL
  SIL --> SOCAL

  subgraph LAA["LA AQUEDUCT — Owens / Mono · LADWP · not monitored"]
    direction TB
    OWN["Mono / Owens snowpack
+ Owens River"]:::ctx
    SFC["San Francisquito Canyon
Power Plants 1 and 2 · St Francis site"]:::ctx
    BOU["Bouquet Reservoir"]:::ctx
    CSC["Sylmar Cascades"]:::ctx
    OWN --> SFC --> BOU --> CSC
  end
  CSC --> SOCAL

  subgraph KRN["KERN RIVER — not monitored"]
    direction TB
    KER["Kern River"]:::ctx --> ISA["Lake Isabella"]:::ctx --> BAK["Bakersfield / Kern ag"]:::ctx
  end

  HAP["Merced at Happy Isles — Yosemite
daily flow · Sierra index"]:::mon
  SIE -.->|same Eastern Sierra snow| HAP

  click PWL "/reservoirs/POWELL/" "Lake Powell — full record"
  click MEA "/reservoirs/MEAD/" "Lake Mead — full record"
  click HAV "/reservoirs/HAVASU/" "Lake Havasu — full record"
  click ORO "/reservoirs/ORO/" "Lake Oroville — full record"
  click SHA "/reservoirs/SHA/" "Shasta Lake — full record"
  click SNL "/reservoirs/SNL/" "San Luis Reservoir — full record"
  click CAS "/reservoirs/CAS/" "Castaic Lake — full record"
  click SIL "/reservoirs/SLW/" "Lake Silverwood — full record"
  click PER "/reservoirs/PRR/" "Lake Perris — full record"
  click LEE "/rivers/" "Rivers — Lees Ferry flow"
  click HAP "/rivers/" "Rivers — Happy Isles flow"
  click SIE "/snowpack/" "Snowpack — Sierra pillows"
  click UCS "/snowpack/" "Snowpack — Upper Colorado basin index"