The Inkwells (also known as The Ink Wells) are two deep natural swimming pools in

Lagunitas Creek Lagunitas Creek is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed December 27, 2017 northward-flowing stream in Marin County, California. It is critically important to the largest s ...

, in

Marin County, California Marin County ( ) is a County (United States), county located in the northwestern part of the San Francisco Bay Area of the U.S. state of California. As of the 2020 United States census, 2020 census, the population was 262,231. Its county seat a ...

. The upper Inkwell is also known as "Shafters", named after the former railroad bridge that bore its name nearby, whereas the lower Inkwell is simply known as "Inkwell" or "Hole" because it is deeper and darker. Together, they are known as "The Inkwells". They are a common swimming spot in summer, despite failing to meet current water quality standards due to high levels of

coliform Coliform bacteria are defined as either motile or non-motile Gram-negative non- spore forming bacilli that possess β-galactosidase to produce acids and gases under their optimal growth temperature of 35–37 °C. They can be aerobes or f ...

. The Inkwells are accessible by car as well as public transit, with a

Marin Transit Marin Transit is a public bus agency serving Marin County, California, in the North Bay region of the San Francisco Bay Area. Marin Transit provides local and rural fixed-route bus services, paratransit services, and school bus services in Mari ...

bus stop being less than a mile away. The Inkwells Bridge, which runs above the inkwells, is part of the

Bay Area Ridge Trail The Bay Area Ridge Trail (shortened as Ridge Trail) is a multi-use trail along the hill and mountain ridgelines surrounding the San Francisco Bay Area, in Northern California. It is planned to extend ; , have been established. When complete, ...

. It also carries pipes that bring water from nearby Kent Lake and the nearby

Nicasio Reservoir Nicasio Reservoir is a shallow, artificial reservoir in the Nicasio Valley region of Marin County, California, United States. It covers and sits in a drainage basin. It was created by the construction of Seeger Dam on the Nicasio Creek in . S ...

to be treated.

Coho salmon The coho salmon (''Oncorhynchus kisutch;'' Karuk: achvuun) is a species of anadromous fish in the salmon family (biology), family and one of the five Pacific salmon species. Coho salmon are also known as silver salmon (or "silvers") and is often ...

can be seen in the pools trying to jump and swim upstream from late fall into winter; the best time to see the salmon is a few days after a heavy rain.

References

{{DEFAULTSORT:Inkwells, The Natural pools Geography of Marin County, California