Last updated on 08/05/2025

Water Quality

Water Quality includes a program of real-time telemetry, generally with 15-minute reporting to the California Data Exchange Center. In addition, the SJRRP initiated a program of manual water quality constituent measurements.

Real-time Telemetry

Map of Stations for Real-time Telemetry
CDEC StationTemperatureECDOTurbiditypHChlorophyll
FWQ - At Friant DamFWQFWQFWQFWQFWQFWQ
SJF - Below FriantSJRSJF
H41 - Highway 41H41H41
DNB - Donny Bridge (Rd 32)DNBDNB
GRF - Gravelly FordGRFGRFGRFGRFGRFGRF
SJB - Below BifurcationSJBSJBSJBSJBSJBSJB
DM3 - Delta Mendota Canal Check 21DM3DM3
SDP - Near Dos PalosSDPSDPSDPSDPSDPSDP
SWA - Washington RoadSWASWASWASWASWASWA
SJS - StevinsonSJSSJS
SSH - Salt SloughSSHSSH
FFB - Fremont Ford BridgeFFBFFB
MSG - Mud SloughMSGMSG
SMN - Near NewmanSMNSMNSMN
SMN FFB MSG SJS SSH SWA SDP DM3 SJB GRF DNB H41 SJF FWQ

Measurements

In addition to the gaged stations described above, the SJRRP took measurements of water quality parameters at a variety of additional locations.

Temperature Atlas

Water Quality Measurements

SJRRP measurements of total suspended solids, EC, pH, Turbidity, DO, bacteria, trace elements and pesticides at eight sites have been added to the Bureau of Reclamation Water Quality Database. Query All Program Information, Station Description field for “Interim Flows”.

Monitoring is organized according to the Interim Flow Water Quality Monitoring Plan.

Seepage Management Projects

Reclamation conducts water quality monitoring to establish the existing (baseline) quality of San Joaquin River (SJR) surface water in the vicinity of anticipated seepage projects in Reach 3 and Reach 4 of the Restoration Area, of surface water within irrigation canals that are potential receiving bodies for SJR seepage, and of groundwater in lands adjacent to the study reaches.