Stream Watch

Our community needs good information to inform decisions about how to take care of our streams and keep them healthy. You can help!

One key question that we still need to answer is: when do our local creeks go dry? If we have a good picture of this across the watershed, we can start to make better choices about where to take conservation actions.

We also need to know: where is the trash? We want to collect trash before it gets to the Napa River.

Click on the 'How to use the tool' tab above for more instructions.

To add an observation, click Add Your Observation.

Observe stream flow and trash in the field using this web form on your mobile device.

You must have internet access and share location information to submit your observation. Note: internet access at some sites depends on cell service provider.

Follow the guidance below to choose the correct category for stream flow and trash based on your current observation.

When observing a site pay close attention to whether you are facing upstream or downstream. A pop-up tab will appear for each site with directions to the site.

Observation Guides


Contribute to the map! Upload your own photos and stream observation.

Observation Stations

Major Streams

County Boundary

Trash Observation Guide

(Click images to view larger)


Not Littered

not littered
Trash cannot be seen on the banks or in the water without searching for it; less than one piece of trash is seen for every 30 feet.

Slightly Littered

A few pieces of trash can be seen, but the majority of the area is free of trash. There is less than 10 pieces on the bank or in the water. 


Trash is spread throughout the majority of the area, with a few areas remaining clean. There are 10 or more pieces of trash within the vicinity.

Very Littered

Trash is seen throughout the area, large piles have accumulated. A serious lack of concern for the area is felt. 

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Stream Flow Observation Guide

The presence and timing of stream flow is an indicator as to the health of a stream. It is important to monitor stream flow conditions over the course of the year to determine when a stream goes dry, since the timing can be critical to local animal, plant and fish species. 


Creek bed is completely dry, there is no water.

Isolated Pools - Example 1

Water in stream, but it is not connected, and does not appear to be flowing. Pools of water separated by rocks or other materials.

Isolated Pools - Example 2

Water in stream, but it is not connected, and does not appear to be flowing. Pools of water separated by rocks or other materials.



Flowing - Example 1

Water is continuous, but may not be moving. If a leaf were on the surface of the water, it would not move downstream.

Flowing - Example 2

Water is slowly moving. Small ripples can be seen on the surface.


Flowing - Example 3

Water is moving quickly, white caps can be visible, but are not a requirement.

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