A new set of boat ramps have been installed at the Alviso Marina which will enable kayaks and small boats to enter San Francisco Bay from San Jose for the first time in 20 years. With this convenient access point, I believer there will be many kayakers interested in paddling in Alviso Slough. However, since there hasn't been a public access point in 20 year, not much has been written about it.
I was fortunate enough to participate in the grand opening of the new boat ramps. See my post
Grand Opening Day of Alviso Slough Boat Ramp
The slough is both wide and deep, making any kayak trips a breeze. Speaking of breeze, in spring and summer afternoons, it gets quite windy here due to the thermal drafts coming from the bay. Hot air in the central valley rises, causing cool air from the coast to be sucked in. Since most of the coast is separated by mountains, with the only opening at the Golden Gate, wind blows north to south starting at about 2 PM.
However, the wind at the boat ramp is not so bad, perhaps because the Alviso Slough is protected by tall levees. The wind is particularly diminished at low tide where the kayak is riding several feet lower still. The further out you go, the more you will feel the head wind.
Here are the first photos of the Alviso Slough from a kayak in probably 20 years:
Here is the official web site of the Alviso Marina. Ignore the picture of the marina. That was taken 20 years ago.
A map of the water trail from the Alviso Marina to the bay along Alviso Slough:
View Alviso Slough kayak trail to the bay in a larger map
Here are some additional useful links that describe the Alviso Slough Trail, which is adjacent to Alviso Slough.
The last 1/2 of this site has excellent large pictures of the Alviso Slough Trail (about 10 pictures), which follows Alviso Slough:
This site describes the Alviso Slough Trail and the history of Alviso: