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Help us see the Bay in a New Way

As you may know, Friends of Casco Bay has joined a worldwide effort to better understand how our waters may be changing—by observing water color.

Since we launched our Color by Numbers pilot project three months ago, 178 of you have signed up to measure the color of Casco Bay. The map of Casco Bay above shows where you have taken 387 color measurements on your smartphones and tablets.

For more than a century, marine scientists have used the Forel-Ule color scale—an index of 21 colors—from blue to greenish blue to yellow to brown—to measure color as a revealing indicator of the health of our oceans, and to document the color of oceans and lakes.

Scientists at Bigelow Laboratory for Ocean Sciences in Boothbay Harbor have observed that the water color of the Gulf of Maine has become yellower over the last century. They are concerned that this color shift may be caused by suspended particles, which can block sunlight that marine plants need to grow, and which may transport pollutants from the land.

Until we launched Color by Numbers, not much color data had been collected in Casco Bay.

Left: Color data in Casco Bay in January 2018 before we launched our Color by Numbers pilot project. Right: Scores of volunteers are helping us fill the map with color measurements.
You are helping us add more data to the map!

Thank you for helping us all learn more about the environmental health of Casco Bay! The more measurements collected, the more our understanding of the Bay improves.

We look forward to keeping you posted about what we are learning.