Lower Mokelumne River l Description of Watershed l Beneficial Uses l Pollution Sources l Potential Pollution Management Strategies.

Lower Mokelumne River

Description of Watershed Beneficial Uses Pollution Sources Potential Pollution

Management Strategies

Description of Watershed

Approximate Area Land Uses Typical Flow Rates Major Fish Species

Approximate Area

Topography– Mountainous– Flat

Water Sources– Upper Mokelumne River

• EBMUD

• Melting snow

Drainage Area = 627 mi2

Land Uses

Agriculture70%

Urban/Suburban10%

Undeveloped20%

Typical Flow Rates 50% Exceeds 437 10% Exceeds 1,680 Max Flow (1986) 6,060 Min Flow (1977) 23

Avg. Annual Flow 730 Avg. Daily Flow 876 Dry Weather Flow 105

Major Fish Species

* Special Concern Species

Chinook Salmon Rainbow Trout Green Sturgeon* Pacific Lamprey River Lamprey* Prickly Sculpin

Sacramento Blackfish Sacramento Squawfish Sacramento Sucker Tule Perch White Sturgeon

Beneficial Uses

Agriculture Recreation Migration Spawning Wildlife Habitat Power Generation

Agriculture

Irrigation (Canals)– 58 MGD to Woodbridge Irrigation District

Stock Watering– Camanche Dam

• Capacity 431,500 ac-ft

– Woodbridge Dam• 2,464 ac-ft

Recreation Contact

– Lodi Lake

– Camanche Reservoir

– New Hope Landing

Canoeing and Rafting

Migration

Fish Ladders

Spawning

Mokelumne River Fish Hatchery– Built by EBMUD as part of water rights deal

– approx. 4 million Salmon and Steelhead Trout per year

Wildlife Habitat

Grazing Hunting

Power Generation

East Bay Municipal Utilities District– Hydroelectric Power - 40 million KW-

hour/year– Enough to meet needs of 10,400 people

Pollution Sources

EPA Index of Watershed Indicators– Rank 4: Less serious water quality problems -

High vulnerability to stressors such as pollutant loadings

Point Source Non-Point Source

Point Sources

No CERCLA Sites Gravel Mining

– 2 major dredge tailing areas w/many gravel pits Industrial Waste Ponds

– 4 main areas Sewage Waste Ponds

– 2 locations Lodi Treatment Plant (4 discharge points)

Non-Point Source

Agriculture– Fertilizers– Pesticides

Farming– Grazing animals

City of Lodi (Storm sewers?) Boating (New Hope Landing)

Potential Pollution Management Strategies Excavate Dredge Tailings Grazing Control Limit boating activities Limit pesticide/fertilizer use ?????