Napa River
The
Napa River
, approximately 50 mi (80 km) long, is a river in northern
California
in the
United States
. It drains a famous
wine
-growing region called the
Napa Valley
in the mountains northeast of
San Francisco
. It rises in northwestern
Napa County
south of
Mt. St. Helena
in the
Mayacamas Mountains
of the California
Coast Ranges
. It flows south for 4 mi (6 km), entering the head of the slender Napa Valley north of
Calistoga
. In the valley it flows southeast past Calistoga and
Napa
, its
head of navigation
. Downstream from Napa it forms a
tidal estuary
, entering
Mare Island Strait
, a narrow channel on the north end of
San Pablo Bay
. Its watershed encompasses approximately 426 sq mi (1120 km²). Best known for the
vineyards
in its valley, the river also provides a habitat for
salmon
and
steelhead
. Although chinook salmon still spawn in the river, the Coho salmon population is extinct in the river and the steelhead population has been greatly reduced in recent years.
External links
Napa River Watershed
UCSB: Napa Watershed
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