New #hiddenhydrology substack "Remembering the River Bièvre: Traces of the lost river of Paris" open.substack.com/pub/hiddenhy...

Great BBC video of the River Bièvre in Paris - the lost river buried in 1912, highlighting the history, burial, and the many traces left of this #hiddenhydrology. www.bbc.com/reel/video/p...

One of my favorite images of Seattle, this 1891 image "Birds-eye-view of Seattle and environs King County, Wash., 1891" drawn by Augustus Koch and published by Hughes Litho. Co. from Chicago. #seattle #hiddenhydrology #history #maps

#OnThisDay in 1813, during the War of 1812, Captain William Black claimed possession of the Columbia River drainage for Great Britain. historylink.org/File/9767

This 1938 map of Seattle's Green Lake was included in a report on algae control for the lake, conducted by the WPA. The map highlights the relative depths, or bathymetry, of the lake as colors, in 5' increments, the dark blue showing depths of around 25' depth. #seattle #hiddenhydrology #maps

Seattle's topography was a constant challenge to development and expansion and multiple regrades were implemented to sluice away hillsides using high pressure water cannons. The blow image shows an example of this c1910, via @historylink.bsky.social

"A layer of concrete that had previously covered the pipeline had helped block the salmon’s passage through the stream...PG&E and CalTrout wrapped up efforts to relocate the pipeline and bury it under the riverbed, allowing salmon to migrate upstream once more." www.sfgate.com/local/articl...

São Paulo "...grew over dozens of waterways that, with the rampant urbanization of the 20th century, were channeled and hidden. It is estimated that More than 300 km of waterways are buried.... famous rivers... now flow invisibly beneath busy avenues." en.clickpetroleoegas.com.br/sob-o-asfalt...

#OnThisDay in 1901, the City of Seattle rejected proposed boulevards along the Lake Washington Ship Canal. www.historylink.org/File/22981

Been researching tons of historical images (maps, photos and illustrations) of Seattle for the book project... (More to come on that). There are such great stories, and images really punch up the narrative. I thought it'd be fun to post some #hiddenhydrology related ones here.

Article 7: Kregg Hetherington, "The Time of Ghost Rivers" explores a ghost river in Montreal, its various revivals in the present, and the halting attempts by urban actors to form relations with it. read.dukeupress.edu/environmenta...

This summer, American Rivers began a multi-year effort with @yubariverpeople.bsky.social and the U.S. Forest Service to find out how many "lost meadows" there really are in California's North Yuba watershed. The results are surprising! 🌾 Read our findings: www.americanrivers.org/2025/11/redi...

Read my most recent post from #HiddenHydrology substack Cartographies of Memory. open.substack.com/pub/hiddenhy...

Here's a new edition of the Lost Streams of Washington, DC map. I've added more stream names, historic springs, and the pipes that carry runoff today.

Since 1905, 85% of the Detroit's historic streams and waterways have been buried for urban development, leading to long-term ramifications for Detroit’s most vulnerable residents. www.bridgedetroit.com/detroits-gho... Ghost streams, hidden hydrology + historic redlining contribute to flooding today.

Scientists trace the origin of water streams at the top of mountains: www.earth.com/news/scienti...