Hazard Warning: Hazard information may be user-submitted and unverified. Conditions change frequently. Always scout rapids and obstacles yourself.
Portage CA

Sack Dam

San Joaquin - Mendota Pool to Merced River Confluence (CA)

Monitor this Rapid
Gauge Conditions
San Joaquin River a Fremont Ford Bridge CA Downstream Primary
Runnable: 400.0 – 8,000.0 CFS

Near end

San Joaquin River near Mendota CA Upstream Primary
Runnable: 200.0 – 6,000.0 CFS
Data from American Whitewater & USGS
CDEC Flow Data California
SAN JOAQUIN RIVER NFW Primary
Elevation: 5,200 ft
Data from California Data Exchange Center (CDEC)
Description

A small dam backs up the river, allowing diversion of most of the flow into the Arroyo Canal on the left. 

Sack Dam  Sack Dam is 5-foot-high low-head structure used to divert water from the San Joaquin River into Arroyo Canal. Diversions to Arroyo canal are usually limited to 600 cfs, but range from 0 to 800 cfs (Reclamation 2009b). Recently, changes in groundwater use are causing subsidence between the Eastside Bypass and the San Joaquin River. The San Luis Canal Company (SLCC) reports recent subsidence of Sack Dam at rates exceeding 0.5 foot per year (SLCC 2013)

Location
Type
Portage
Difficulty
Class N/A
Mile Marker
22.0 mi
Directions
Navigate
View Full Run
Mendota Pool to Merced River Confluence
San Joaquin
I 86.3 mi
Portage recommended — Scout before running and consider carrying around this feature.
Current Conditions
5-Day Forecast
Whitewater data from
American Whitewater