2001
| Date | Location/Colony | Event |
| 03/20/01 | Rice Island | Fencing and flagging of Rice Island colony site completed by ODFW |
| 03/24/01 | Columbia River Estuary | First terns observed in estuary (28, northeast spit on East Sand Island) |
| 03/27/01 | Crescent Island | First terns on colony (4) |
| 03/27/01 | East Sand Island | First cormorants on colony (200) |
| 03/30/01 | East Sand Island | Habitat improvements completed |
| 03/31/01 | East Sand Island | Decoys and sound system deployed |
| 03/31/01 | East Sand Island | First terns on colony (24) |
| 04/03/01 | East Sand Island | Colony monitors on island |
| 04/04/01 | Rice Island | Decoys, sound system, and dummy rocket net deployed |
| 04/10/01 | Three Mile Canyon Island | Evidence of mink predation observed (6 California gull carcasses w/puncture wounds on heads and neck) |
| 04/11/01 | Rice Island | First terns on colony (22) |
| 04/11/01 | Tacoma/Asarco | First terns on colony (13) |
| 04/13/01 | Rice Island | Colony monitors on island |
| 04/13/01 | Tacoma/Experimental Barge | Barge with decoys and sound system deployed in Commencement Bay |
| 04/14/01 | Three Mile Canyon Island | First terns on colony (5) |
| 04/14/01 | Tacoma/Asarco | Decoys and sound systems deployed at rocket netting site |
| 04/16/01 | Rice Island | Rocket nets set out on colony |
| 04/16/01 | Crescent Island | First eggs observed on colony (2 nests w/ 1 egg each) |
| 04/19/01 | Tacoma/Asarco | Cannon-netting conducted at Asarco (29 terns captured, 28 color banded, 0 mortalities/injuries) |
| 04/19/01 | East Sand Island | First eggs observed on colony (1 nest w/ 1 egg) |
| 04/20/01 | Rice Island | Rocket-netting completed (49 terns captured, 30 radio tagged/banded, 0 mortalities/injuries) |
| 04/20/01 | Rice Island | Flagging installed in area of colony left open for rocket-netting (entire former colony area either fenced or flagged) |
| 04/22/01 | Three Mile Canyon Island | First eggs observed on colony (1 nest w/ 1 egg; later depredated, probably by gull) |
| 04/25/01 | Miller Sands Spit | Terns attempting to nest in the upper estuary on Miller Sands Spit (190 terns, 55 nest scrapes observed) |
| 04/26/01 | Miller Sands Spit | Flagging of Miller Sands Spit colony area completed by ODFW |
| 04/27/01 | Tacoma/Experimental Barge | First terns observed on barge colony (2) |
| 04/27/01 | Tacoma/Asarco | Cannon-netting conducted at Asarco (10 terns captured, 10 color banded, 0 mortalities/injuries) |
| 05/01/01 | Rice Island | Terns attempting to nest on East Ridge (96 terns, 6 nest scrapes observed) |
| 05/02/01 | Rice Island | Terns attempting to nest on North Shore (87 terns, 8 nest scrapes observed) |
| 05/06/01 | Tacoma/Asarco | Cannon-netting conducted at Asarco (9 terns captured, 9 color banded, 0 mortalities/injuries) |
| 05/07/01 | Tacoma/Asarco | Cannon-netting conducted at Asarco (6 terns captured, 6 color banded, 0 mortalities/injuries) |
| 05/13/01 | Crescent Island | First chick observed on colony (4 nests w/ 1 chick each, 1 nest w/ 2 chicks; expected first hatch date: 5/11) |
| 05/14/01 | Tacoma/Experimental Barge | First observation of adult tern digging nest scrape on barge |
| 05/15/01 | Tacoma/Experimental Barge | First egg observed on barge colony (1 nest w/ 1 egg) |
| 05/16/01 | East Sand Island | First chick observed on colony (5 nests w/ 1 chick each) |
| 05/18/01 | East Sand Island | Noose-matting and radio-tagging of nesting terns completed (24 terns captured and radio-tagged, 0 mortalities/injuries) |
| 05/18/01 | Miller Sands Spit | Terns attempting to nest in unflagged area on Miller Sands Spit (198 terns, 99 nest scrapes observed) |
| 05/20/01 | Miller Sands Spit | No terns observed nesting or roosting in upland areas on Miller Sands Spit |
| 05/21/01 | All colonies | Aerial photo census was conducted. Counts of birds in photos are used along with ground counts of incubating birds to estimate the number of breeding pairs on each colony |
| 05/24/01 | Rice Island | Abandoned egg and 230 terns observed on East Ridge |
| 05/25/01 | Rice Island | Egg on East Ridge depredated (presumably by gull) and 12 terns counted at the site |
| 05/25/01 | Tacoma/Foss Barge Boom | Terns begin nesting on Foss Barge (located near experimental tern barge). Roughly 450 terns and 15 eggs counted at the site. |
| 05/25/01 | Tacoma/Foss Barge Boom | Terns abandon Foss barge and begin nesting on Crowley barge (both located near experimental tern barge). Roughly 690 terns on barge, of which 50 are apparently incubating eggs. |
| 05/27/01 | Tacoma/Experimental Barge | Terns nesting and roosting on experimental barge appear to have reached near maximum capacity (roughly 400 terns). |
| 05/28/01 | East Sand Island | Twenty recently hatched tern chicks were collected from the colony for captive rearing experiments |
| 05/30/01 | Tacoma/Foss Barge | Crowley Barge moved off the Foss barge boom causing terns to relocate to adjacent barges (roughly 620 terns). |
| 05/31/01 | Tacoma/Experimental Barge | Experimental tern barge was dismantled and removed from Commencement Bay at the request of the Puyallup Tribe. Nearly 1,000 tern eggs were collected from the barge by WDFW. |
| 06/01/01 | Tacoma/Foss Barge Boom | Following the removal of the experimental tern barge, terns abandoned roost and nest sites on barges on the Foss barge boom. |
| 06/03/01 | Tacoma/Commencement Bay | Only 175 terns counted in the Commencement Bay area (compared to 675 - 900 terns prior to the removal of the experimental tern barge). |
| 06/07/01 | Miller Rocks | Nesting terns (32 total terns, 17 incubating) discovered on Miller Rocks in early incubation. Miller Rocks is located on the Columbia River near the mouth of the Deschutes River. |
| 06/07/01 | East Sand Island | Terns attempting to nest on a satellite colony above the high-high tide line on the beach southeast of the East Sand Island tern colony (250 total terns, 100 incubating) |
| 06/15/01 | Tacoma/Port of Tacoma | Tern chicks (4) were observed on roof of the Northcoast Yachts building |
| 06/21/01 | Tacoma/Port of Tacoma | Nesting terns on roof of the Northcoast Yachts building failed (no terns observed on roof on aerial flight) |
| 06/22/01 | Crescent Island | First fledgling (1) observed at colony |
| 06/24/01 | East Sand Island | First fledglings (2) observed at colony |
| 07/02/01 | East Sand Island | Second aerial photo census was conducted. Counts of birds in photos are used along with ground counts to estimate the number of young produced at the colony this year |
| 07/11/01 | Solstice Island | Tern chicks near fledging age (103) banded at the colony |
| 07/11/01 | Crescent Island | Tern chicks near fledging age (96) banded at the colony |
| 07/16/01 | East Sand Island | Tern chicks near fledging age (290) banded at the colony |
| 07/26/01 | All colonies | Final day of data collection on terns for the 2001 field season |