Napa River
Napa River | |
---|---|
Location | |
Country | United States |
State | California |
Region | Napa County, Solano County |
City | Napa |
Physical characteristics | |
Source | Mount Saint Helena |
• location | Mayacamas Mountains |
• coordinates | 38°39′52″N 122°37′14″W / 38.66444°N 122.62056°W[1] |
• elevation | 3,745 ft (1,141 m)[2] |
Mouth | Carquinez Strait |
• location | San Pablo Bay |
• coordinates | 38°4′12″N 122°14′38″W / 38.07000°N 122.24389°W[1] |
• elevation | 0 ft (0 m) |
Length | 55 mi (89 km)[3] |
Basin size | 426 sq mi (1,100 km2)[4] |
Discharge | |
• average | 210 cu ft/s (5.9 m3/s) |
• minimum | 0 cu ft/s (0 m3/s) |
• maximum | 26,200 cu ft/s (740 m3/s) |
Basin features | |
Tributaries | |
• left | Conn Creek, Rector Creek, Carneros Creek |
The Napa River is a
Course
The Napa River rises in northwestern
Watershed
The Napa River watershed encompasses approximately 426 square miles (1,103 km²). Larger tributaries, such as Dry, Conn, and Soda creeks, show signs of recent incision and have graded to the incised current level of the mainstem Napa River. In some cases, smaller tributaries cutting across the valley floor have not fully adjusted to the lowered level of the mainstem and are elevated at their confluence with the mainstem, forming potential barriers to upstream fish migration. Several large dams were built between 1924 and 1959 on major eastside tributaries (Conn, Rector, Milliken, and Bell dams) and the northern headwaters of the Napa River (Kimball Dam). In addition, many smaller dams can be found throughout the watershed.[6] These numerous dams are impassable barriers to salmon and steelhead seeking their historic spawning grounds.
Ecology
The river also supports a remarkable diversity of fishes and recovering
The Napa River basin is estimated to have historically supported a spawning run of 6,000–8,000 steelhead, and as many as 2,000–4,000 coho salmon (Oncorhynchus kisutch).[6][10] By the late 1960s, coho salmon were extirpated from the watershed and the steelhead population is now reduced to less than a few hundred adults. Flow reductions in key rearing streams have reduced food availability for juvenile steelhead, causing reduced growth and survival.[6] Recently, a chum salmon (Oncorhynchus keta) was caught in the river.[11] In addition, a fourth salmon species, sockeye salmon (Oncorhynchus nerka), was also identified in the Napa River.[9]
Although diminished, the Napa River basin continues to support a fish community of greater diversity than even the Sacramento and San Joaquin River systems, including a nearly intact community of sixteen native fish species, including Steelhead, fall-run Chinook salmon,
The California golden beaver (Castor canadensis subauraticus) was historically extant.[13][14][15][16] Recently beaver have recolonized the Napa River[17][18] and have been documented in Napa as well as near Rutherford and Oak Knoll.[19]
Restoration
As part of urban renewal in the 1970s, a concrete cover was removed from culverted sections of the Napa Creek, re-exposing the water to daylight. There is some debate as to whether this constituted one of the country's earliest "daylighting" projects, since the construction was undertaken with little thought to the river's ecology or restoration of riparian habitat.[20] [21] This construction is not believed to be responsible for later flooding along the river.
More recently, vineyard owners with property that borders the Rutherford Reach, a 4.5-mile (7.2 km) stretch of the Napa River between St. Helena and Oakville, are allowing prime land to return to a natural state in order to help preserve the ecology of the river. The project known as Rutherford Restoration Project involves 23 property owners have combined forces to provide 18 acres (73,000 m2) of land to this cause. [22] After the restoration, native North American beaver returned to the area, establishing 3-4 beaver dams.[18] These keystone species have been shown to increase fish, bird and mammal abundance and diversity in California rivers and streams. They also benefit trout and salmon by reducing sediment loads and improve water quality.[23] The southern part of the river has also been undergoing restoration as former salt ponds along the river are being restored to their natural state.[24]
Napa Flood of 1986
In 1986, the worst of 23 floods recorded since 1865 on the Napa River occurred. 5,000 people were evacuated, 250 homes were destroyed, and three people lost their lives.
After the devastating flood of 1986, the dormant Napa River Flood Project was revitalized. The Project underwent a lengthy redesign and was approved by the local voters in 1998. Construction began in 2000 and was completed by 2015.
Recreation
The Napa River and the surrounding watershed provide many recreational opportunities.
See also
References
- ^ a b c U.S. Geological Survey Geographic Names Information System: Napa River
- ^ Google Earth elevation for source coordinates
- ^ About Napa River Archived 2009-05-05 at the Wayback Machine, Developing A Nutrient Management Plan for Napa River Watershed
- ^ Napa River Watershed Archived 2008-05-11 at the Wayback Machine, Napa County Resource Conservation District
- ^ Courtney, Kevin (March 3, 2009). "A search for Napa River's start runs through the heart of the valley". Napa Valley Register. Napa, CA: Lee Enterprises, Inc. Retrieved August 29, 2010.
- ^ a b c d e Napa River Basin Limiting Factors Analysis (PDF) (Report). Stillwater Sciences. 2002. Retrieved 2010-07-10.
- ^ Jonathan Koehler; Chad Edwards (August 2008). Napa River Salmon Monitoring Program Spawning Year 2007 Report (PDF) (Report). Napa County Resource Conservation District. Retrieved 2010-07-10.
- ^ Leidy, R.A., G.S. Becker, B.N. Harvey (2005). Historical distribution and current status of steelhead/rainbow trout (Oncorhynchus mykiss) in streams of the San Francisco Estuary, California (PDF) (Report). Oakland, CA: Center for Ecosystem Management and Restoration. Retrieved 2010-07-10.
{{cite report}}
: CS1 maint: multiple names: authors list (link) - ^ a b John Carlos Garza; Eric D. Crandall (2013). Genetic Analysis of Chinook Salmon from the Napa River, California (PDF) (Report). Fisheries Ecology Division Southwest Fisheries Science Center and Institute of Marine Sciences University of California, Santa Cruz. Retrieved 2016-12-20.
- ^ Treleven, Mike (August 16, 2010). "More fish seem to be living in Napa River". Napa Valley Register. Napa, CA: Lee Enterprises, Inc. Retrieved August 29, 2010.
- ^ a b Jonathan Koehler (2008). Fishes of the Napa River Watershed (PDF) (Report). Napa County Resources Conservation District. Retrieved 2010-07-11.
- ^ Robert A. Leidy (1999). Robert A. Leidy Fish Survey 1992-1998 Bay Area Stream Fishes (Report). San Francisco Estuary Institute. Retrieved 2010-07-11.
- ^ John E. Skinner, ed. (1962). The Mammalian Resources in An Historical Review of the Fish and Wildlife Resources of the San Francisco Bay Area. Archived from the original (PDF) on July 26, 2011. Retrieved May 19, 2014.
- JSTOR 25160711.
- JSTOR 25155825.
- ^ Christopher W. Lanman; Kate Lundquist; Heidi Perryman; J. Eli Asarian; Brock Dolman; Richard B. Lanman; Michael M. Pollock (Fall 2013). "The historical range of beaver (Castor canadensis) in coastal California: an updated review of the evidence". California Fish and Game. 99 (4): 193–221. Retrieved 2014-05-19.
- ^ T. C. Dewberry. Development and Application of Anchor Habitat Approaches to Salmon Conservation: A synthesis of data and observations from the Napa watershed, California (PDF) (Report). Friends of Napa River. Retrieved 2010-07-10.
- ^ a b Jennifer Huffman (2011-12-09). "EPA supports Napa River restoration efforts". Napa Valley Register. Retrieved 2011-12-10.
- ISBN 978-0-520-26910-1.
- ^ "Bay Area Cities Rediscover the Creeks Under Their Streets". Streetsblog. 9 April 2010.
- ^ Courtney, Kevin (August 29, 2010). "Early settlers found a Shangri-La, then they drained and boxed it". Napa Valley Register. Napa, CA: Lee Enterprises, Inc. Retrieved August 29, 2010.
- ^ Courtney, Kevin (September 6, 2010). "Vintners sacrifice vines to create a more natural Napa River". Napa Valley Register. Napa, CA: Lee Enterprises, Inc. Retrieved September 6, 2010.
- ^ Pollock, Michael M.; Morgan Heim; Danielle Werner (2003). "Hydrologic and geomorphic effects of beaver dams and their influence on fishes" (PDF). American Fisheries Society Symposium. 37: 213–233. Archived from the original (PDF) on 2011-07-07. Retrieved 2011-12-09.
- ^ Courtney, Kevin (September 5, 2010). "Given up for dead, lost wetlands springing back to life in south county". Napa Valley Register. Napa, CA: Lee Enterprises, Inc. Retrieved September 6, 2010.