Station Name: COAST FORK WILLAMETTE R BLW COTTAGE GROVE DAM, OR
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 738 feet / 225 meters

Nearest Address:
75800 Reservoir Rd
Cottage Grove, OR 97424
Lane County

GPS Coordinates: 43.72067785, -123.0497994

Nearby Water Temperatures

Flood Warning issued December 19 at 8:29AM PST until December 19 at 10:31PM PST by NWS Portland OR

Effective: Fri December 19, 2025, 8:29 AM
Expires: Fri December 19, 2025, 9:00 PM

...The Flood Warning is extended for the following rivers in Oregon... Alsea River near Tidewater affecting Benton and Lincoln Counties. Nehalem River near Foss affecting Clatsop and Tillamook Counties. Siletz River at Siletz affecting Lincoln County. Wilson River near Tillamook affecting Tillamook County. ...The Flood Warning continues for the following rivers in Oregon... Siuslaw River near Mapleton affecting Lane County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Siuslaw River near Mapleton. * WHEN...Until late this evening. * IMPACTS...Above 22.0 feet, expect widespread flooding of low-lying land. Several homes and structures in low areas of Mapleton start to flood. Numerous rural roads along and near the Siuslaw River will likely be flooded, and water begins to cover the lower sections of Hwy 126 at this stage. Flooding may be exacerbated during high tide. * ADDITIONAL DETAILS... - At 8:00 AM PST Friday the stage was 20.8 feet. - Bankfull stage is 15.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 8:00 AM PST Friday was 21.6 feet. - Forecast...The river has crested and will fall below flood stage late this evening. - Flood stage is 18.0 feet. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive through flooded areas. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued this afternoon at 230 PM PST.

Flood Warning issued December 19 at 8:26AM PST until December 20 at 3:45AM PST by NWS Portland OR

Effective: Fri December 19, 2025, 8:26 AM
Expires: Fri December 19, 2025, 9:00 PM

...The Flood Warning is extended for the following rivers in Oregon... Mohawk River Near Springfield affecting Lane County. * WHAT...Minor flooding is forecast. * WHERE...Mohawk River near Springfield. * WHEN...From this morning to late tonight. * IMPACTS...Above 15.0 feet, expect flooding of low areas and some rural roads near the river. * ADDITIONAL DETAILS... - At 7:45 AM PST Friday the stage was 15.0 feet. - Bankfull stage is 12.5 feet. - Forecast...The river will rise above flood stage this morning and crest around 16.5 feet late this afternoon, then fall below flood stage late tonight. - Flood stage is 15.0 feet. - http://www.weather.gov/safety/flood

Motorists should not attempt to drive around barricades or drive through flooded areas. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued this evening at 900 PM PST.

Flood Watch issued December 19 at 6:15AM PST until December 20 at 4:00PM PST by NWS Portland OR

Effective: Fri December 19, 2025, 6:15 AM
Expires: Fri December 19, 2025, 4:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Oregon, including the following areas, Benton County Lowlands, Cascade Foothills of Marion and Linn Counties, Cascades of Lane County, Cascades of Marion and Linn Counties, Central Coast of Oregon, Central Columbia River Gorge I-84 Corridor, Central Oregon Coast Range, Central Oregon Coast Range Lowlands, Clackamas County Cascade Foothills, Clatsop County Coast, East Central Willamette Valley, East Portland Metro, Inner Portland Metro, Lane County Cascade Foothills, Lane County Lowlands, Linn County Lowlands, Lower Columbia River, North Oregon Cascades, North Oregon Coast Range, North Oregon Coast Range Lowlands, Outer Southeast Portland Metro, Portland West Hills and Chehalem Mountain, Tillamook County Coast, Tualatin Valley, Upper Hood River Valley, West Central Willamette Valley, West Columbia River Gorge I-84 Corridor and West Columbia River Gorge of Oregon above 500 ft and southwest Washington, including the following areas, Central Columbia River Gorge SR 14 Corridor, Cowlitz County Lowlands, East Clark County Lowlands, Inner Vancouver Metro, North Clark County Lowlands, South Washington Cascade Foothills, South Washington Cascades, South Washington Coast, West Columbia River Gorge SR 14 Corridor, Willapa Hills and Willapa and Wahkiakum Lowlands. * WHEN...Through Saturday afternoon. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Area creeks and streams are running high and could flood with more rain. * ADDITIONAL DETAILS... - Flood potential remains high today even though much less rain is forecast. Many area rivers and streams are rising this morning, and slow responding rivers could see rises into Saturday afternoon. With the saturated soils and high rivers and creeks, any additional rain will slow receding of the water and continue the potential for flooding. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Winter Weather Advisory issued December 19 at 2:14AM PST until December 20 at 4:00AM PST by NWS Portland OR

Effective: Fri December 19, 2025, 2:14 AM
Expires: Fri December 19, 2025, 4:00 PM

* WHAT...Snow expected. Total snow accumulations of 6-11 inches, mainly above 4000 feet. Winds gusting as high as 40 mph. * WHERE...Cascades of Lane County. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

Have a winter emergency driving kit readily available. Common items to include: flashlight, batteries, blankets, a shovel, water, non-perishable food items, tire chains, etc. Be aware that walking surfaces may be slick. Walk with extra care. For the latest road conditions and chain restrictions in Oregon, call 5 1 1, or visit: www.tripcheck.com. For the latest road conditions and chain restrictions in Washington, visit: wsdot.com/travel/real-time/map

Coastal Flood Advisory issued December 18 at 6:28PM PST until December 19 at 4:00PM PST by NWS Portland OR

Effective: Thu December 18, 2025, 6:28 PM
Expires: Fri December 19, 2025, 4:00 PM

* WHAT...Tidal overflow flooding expected. * WHERE...North and Central Coast of Oregon. * WHEN...From 10 AM to 4 PM PST Friday. The highest threat for minor flooding is during the high tides from 11 AM to 1 PM PST. * IMPACTS...Minor flooding and erosion, up to one foot above ground level, during high tides is expected in the low lying areas near bays, sloughs, and the lower reaches of the coastal rivers. * ADDITIONAL DETAILS...The tidal overflow concerns are due to the combination of high river levels and high tides.

A Coastal Flood Advisory means that tidal overflow flooding is expected. Coastal residents in the warned area should be alert for rising water, and take appropriate action to protect life and property.

Flood Watch issued December 19 at 2:43PM PST until December 20 at 4:00PM PST by NWS Portland OR

Effective: Fri December 19, 2025, 2:43 PM
Expires: Sat December 20, 2025, 6:00 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Northwest Oregon and southwest Washington including the following counties. In Oregon: Benton, Clackamas, Clatsop, Columbia, Hood River, Lane, Linn, Lincoln, Marion, Multnomah, Polk, Tillamook, Washington, and Yamhill. In Washington: Clark, Cowlitz, Pacific, Skamania, and Wahkiakum. * WHEN...Through Saturday afternoon. * IMPACTS...Creeks and streams may rise out of their banks. Landslides and debris flows are possible during this flood event. People, structures, and roads located below steep slopes, in canyons, and near the mouths of canyons may be at serious risk from rapidly moving landslides. * ADDITIONAL DETAILS... - Although heavy rain has ended, widespread river flooding is expected to continue through Friday night, except through Saturday along slower responding rivers. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Winter Weather Advisory issued December 19 at 2:21PM PST until December 20 at 4:00AM PST by NWS Portland OR

Effective: Fri December 19, 2025, 2:21 PM
Expires: Sat December 20, 2025, 4:00 AM

* WHAT...Snow. Additional snow accumulations 1 to 3 inches. * WHERE...Cascades of Lane County. * WHEN...Until 4 AM PST Saturday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.

Have a winter emergency driving kit readily available. Common items to include: flashlight, batteries, blankets, a shovel, water, non-perishable food items, tire chains, etc. Be aware that walking surfaces may be slick. Walk with extra care. For the latest road conditions and chain restrictions in Oregon, call 5 1 1, or visit: www.tripcheck.com. For the latest road conditions and chain restrictions in Washington, visit: wsdot.com/travel/real-time/map

Hydrologic Outlook issued December 18 at 3:15PM PST by NWS Medford OR

Effective: Thu December 18, 2025, 3:15 PM
Expires: Fri December 19, 2025, 2:00 PM

ESFMFR An atmospheric river arrives tonight and persists through Friday, bringing a round of moderate to heavy rainfall. Rain amounts of 2 to 4 inches are expected, with the highest amounts likely in Curry County. This is a slight decrease in rainfall amounts as the focus of the atmospheric river lingers a bit longer to our north before arriving in Douglas County and farther south. Despite the slightly reduced rainfall expected, small streams and creeks are still likely to run high and could result in nuisance flooding along with ponding of water on roadways during periods of heavy rain. Significant rises on mainstem rivers are expected, but the overall concern for widespread river flooding is low at this time due to antecedent dry conditions and minimal snowpack. We will be monitoring rivers in the Coquille and Umpqua Basins for flooding potential. This product will be updated as necessary. Watches and warnings may be issued by the National Weather Service if this situation worsens.