D.C. and nearby

Slash Run: How a DC stream became a sewer, and then a secret 10 April 2024

An article for GGWash

City of streams, city of pipes 28 March 2024

Mapping D.C.'s lost streams — 2024 edition

Slash Run and Brown’s Run 28 November 2023

A new lost streams map

A LIDAR-based shaded relief map of D.C. 31 October 2023

A modeshare snapshot of 17th St. NW 5 June 2018

A modeshare snapshot

CSO #043, Rock Creek, D.C. 3 June 2018

Combined sewer overflow

Rock Creek in the snow, D.C. 21 March 2018

An early-spring snowstorm

Imagining a safer 18th St. NW 12 June 2017

Tools to envision different street layouts

DC–Baltimore Railroads and Terrain 25 May 2015

Anacostia River at Bladensburg, Md. 30 June 2014

Floodgates, levees, and marshes

The Brewer's Archipelago and Distillery Islands 11 February 2014

Mapping DC's distilleries and breweries

DC streams in 1859, plotted on a modern map 7 July 2013

Uncovering long-lost historic hydrologic features.

Really big pipes 24 May 2013

Preview of the Hidden Rivers and Lost Neighborhoods bike tour.

Gardens on a rainy Saturday 18 May 2013

A tour of four gardens in NW DC – a fine way to spend a drizzly Saturday.