Watermark.
Greenville · Darke Co
Switch site 35 sites · 10 basins2 states Group by
OH Ohio 34
BOSC BOSC Lima Ottawa River · Lima, OH Building Under construction #1261 URB Urbana Mad River · Great Miami Live Investigating #1263 DEF Defiance Maumee mainstem Queued Investigating #1264 FIN Findlay Blanchard River Queued Investigating #1265 TOL Toledo Lucas Co WRRF Queued Investigating #1266 VWT Van Wert Town Creek · Little Auglaize Queued Investigating #1267 BRY Bryan Prairie Creek · Tiffin River Queued Investigating #1268 OTW Ottawa Blanchard River (lower) Queued Investigating #1269 SPR Springfield Mad River · Great Miami Queued Investigating #1270 XEN Xenia Little Miami Queued Investigating #1271 WPA Dayton · WPAFB Mad River · Great Miami Queued Investigating #1272 HAM Hamilton · Middletown Great Miami (lower) Queued Investigating #1273 TRP Troy · Piqua Great Miami (upper) Queued Investigating #1274 SID Sidney Great Miami · headwaters Queued Investigating #1275 GRV Greenville · Darke Co Stillwater · basin divide Queued Investigating #1276 WIL Wilmington Todd Fork · Little Miami Queued Investigating #1277 WUN West Union · Adams Co Ohio Brush Creek · Ohio River Queued Investigating #1278 NAL New Albany · Licking Scioto ↔ Muskingum divide Tracking Investigating #1279 COL Columbus Scioto · Olentangy Tracking Investigating #1280 CSH Coshocton Tuscarawas + Walhonding Tracking Investigating #1281 PIK Piketon Scioto River · PORTS Tracking Investigating #1282 SAN Sandusky · Perkins Twp Sandusky Bay · Lake Erie Tracking Investigating #1283 NWK Newark Licking River Tracking Investigating #1284 ZAN Zanesville Muskingum mainstem Tracking Investigating #1285 FRE Fremont · Clyde Lower Sandusky Tracking Investigating #1286 TIF Tiffin Sandusky (mid) Tracking Investigating #1287 BUC Bucyrus Sandusky headwaters Tracking Investigating #1288 CLE Cleveland Lower Cuyahoga Tracking Investigating #1289 AKR Akron Upper Cuyahoga · CVNP Tracking Investigating #1290 LRD Lordstown · Warren Upper Mahoning Tracking Investigating #1291 YNG Youngstown Mahoning mainstem Tracking Investigating #1292 LAN Lancaster Upper Hocking Tracking Investigating #1293 ATH Athens Lower Hocking Tracking Investigating #1294 LOG Logan Hocking Hills Tracking Investigating #1295
MAU Maumee Basin 8 sites
2MI The Two Miamis 9 sites
SE Southeastern Basins 10 sites
NE Northeast Basins 8 sites
Each site is a section of the Watermark platform — pivoted by basinstate. Live & building sites open; queued and tracking sites route to their coming-soon / watch page.
Switch site 35 sites · 10 basins2 states 35 open Group by

Each site is one Watermark investigation. The page color says what opens; the campus line is the build on the ground — two different clocks.

OH Ohio 34
BOSC BOSC Lima Ottawa River · Lima, OH Draft Under construction #1261 URB Urbana Mad River · Great Miami Open Investigating #1263 DEF Defiance Maumee mainstem Queued Investigating #1264 FIN Findlay Blanchard River Queued Investigating #1265 TOL Toledo Lucas Co WRRF Queued Investigating #1266 VWT Van Wert Town Creek · Little Auglaize Queued Investigating #1267 BRY Bryan Prairie Creek · Tiffin River Queued Investigating #1268 OTW Ottawa Blanchard River (lower) Queued Investigating #1269 SPR Springfield Mad River · Great Miami Queued Investigating #1270 XEN Xenia Little Miami Queued Investigating #1271 WPA Dayton · WPAFB Mad River · Great Miami Queued Investigating #1272 HAM Hamilton · Middletown Great Miami (lower) Queued Investigating #1273 TRP Troy · Piqua Great Miami (upper) Queued Investigating #1274 SID Sidney Great Miami · headwaters Queued Investigating #1275 GRV Greenville · Darke Co Stillwater · basin divide Queued Investigating #1276 WIL Wilmington Todd Fork · Little Miami Queued Investigating #1277 WUN West Union · Adams Co Ohio Brush Creek · Ohio River Queued Investigating #1278 NAL New Albany · Licking Scioto ↔ Muskingum divide Watching Investigating #1279 COL Columbus Scioto · Olentangy Watching Investigating #1280 CSH Coshocton Tuscarawas + Walhonding Watching Investigating #1281 PIK Piketon Scioto River · PORTS Watching Investigating #1282 SAN Sandusky · Perkins Twp Sandusky Bay · Lake Erie Watching Investigating #1283 NWK Newark Licking River Watching Investigating #1284 ZAN Zanesville Muskingum mainstem Watching Investigating #1285 FRE Fremont · Clyde Lower Sandusky Watching Investigating #1286 TIF Tiffin Sandusky (mid) Watching Investigating #1287 BUC Bucyrus Sandusky headwaters Watching Investigating #1288 CLE Cleveland Lower Cuyahoga Watching Investigating #1289 AKR Akron Upper Cuyahoga · CVNP Watching Investigating #1290 LRD Lordstown · Warren Upper Mahoning Watching Investigating #1291 YNG Youngstown Mahoning mainstem Watching Investigating #1292 LAN Lancaster Upper Hocking Watching Investigating #1293 ATH Athens Lower Hocking Watching Investigating #1294 LOG Logan Hocking Hills Watching Investigating #1295
MAU Maumee Basin 8 sites
2MI The Two Miamis 9 sites
SE Southeastern Basins 10 sites
NE Northeast Basins 8 sites
The page — what opens on Watermark Open · Draftfull record Queued · Watchingpreview page Restrictedrequest access
The campus — the build on the ground Investigating Confirmed Under construction Operational
Queued
Watermark network · Stillwater · basin divide · tracking issue #1276

Greenville · Darke Co is being assembled.

A record site for the Stillwater · basin divide. We're generalizing the Watermark platform from the Lima reference build out across the watershed network — this site is in the build queue.

Build status 0 of 3 stages started
queued
Site scaffold
Routes and the forest chrome wired up for the Greenville · Darke Co record.
queued
Data tier
Stillwater · basin divide sources ingested, structured, and provenance-linked.
queued
Frontend
Record screens, profiles, timeline, and the story.
What will land here — the same record grammar as Lima
Records
The source record
Documents, structured records, and the external reference datasets behind them.
Chronology
The timeline
Events along the Stillwater · basin divide, each tied back to its source.
People & places
Profiles
The entities, agencies, and sites that recur across the record.
Narrative
The story
A reading path through the record for first-time visitors.
Get notified
Know when Greenville · Darke Co goes live.

Follow the tracking issue — one update when the Stillwater · basin divide record opens. No list, no noise.

Watch #1276 on GitHub
Complete
See the Lima build

Watermark — the reference site on the Ottawa River, Lima OH. The complete record, timeline, and story that Greenville · Darke Co is modeled on.

Explore the reference site ›

Provenance-first, from the first commit. Like every Watermark site, Greenville · Darke Co will carry a source for every figure, label its inferences, and show redactions rather than hide them. Nothing here is a verdict.