Several days of nearly non-stop weather systems brought copious amounts of rainfall to northwest Oregon.  With moderate temperatures in place, very close to all of this rainfall became run-off, and many rivers over the area swelled in response.  Many rivers reached and maintained flood stage for a couple days.
One river in particular, the Wilson River near Tillamook, recorded record flooding.  This river's flood stage is 12.0 feet, and the river crested at 22.8 feet (38,500 cfs), well above major flood stage.  The town of Tillamook, downstream from this gauge, was underwater for several days after the crest.

Flood in LINCOLN, OREGON
From 06-NOV-06 07:00:00 to 07-NOV-06 20:00:00 (PST-8)
Location: SILETZ
Flood cause: Heavy Rain
Property damage: 0.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Siletz River near Siletz crested at 23.0 feet on November 7th, with flood stage at 16.0 feet.

Flood in TILLAMOOK, OREGON
From 06-NOV-06 07:00:00 to 07-NOV-06 20:00:00 (PST-8)
Location: TILLAMOOK
Flood cause: Heavy Rain
Property damage: 0.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Trask River near Tillamook crested at 19.6 feet on November 7th, with flood stage at 16.5 feet.

Flood in LANE, OREGON
From 07-NOV-06 07:00:00 to 07-NOV-06 20:00:00 (PST-8)
Location: MAPLETON
Flood cause: Heavy Rain
Property damage: 0.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Siuslaw River near Mapleton crested at 18.8 feet on November 7th, with flood stage at 18.0 feet.

Flood in CLACKAMAS, OREGON
From 07-NOV-06 07:00:00 to 08-NOV-06 20:00:00 (PST-8)
Location: ESTACADA
Flood cause: Heavy Rain
Property damage: 0.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Clackamas River near Estacada crested at 22.3 feet on November 7th, with flood stage at 20.0 feet.

Flood in CLACKAMAS, OREGON
From 07-NOV-06 07:00:00 to 07-NOV-06 20:00:00 (PST-8)
Location: OREGON CITY
Flood cause: Heavy Rain
Property damage: 0.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Clackamas River near Oregon City crested at 39.4 feet on November 7th, with flood stage at 39.0 feet.

Flood in MARION, OREGON
From 07-NOV-06 07:00:00 to 08-NOV-06 20:00:00 (PST-8)
Location: JEFFERSON
Flood cause: Heavy Rain
Property damage: 0.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Santiam River near Jefferson crested at 15.2 feet on November 7th, with flood stage at 15.0 feet.

Flood in TILLAMOOK, OREGON
From 06-NOV-06 07:00:00 to 08-NOV-06 20:00:00 (PST-8)
Location: TILLAMOOK
Flood cause: Heavy Rain
Property damage: 15.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Wilson River near Tillamook crested at 22.8 feet on November 7th, with flood stage at 12.0 feet and major flood stage at 19.0 feet.  This set a record flood stage for the gauge, and caused major flooding problems for the city of Tillamook, down river from the gauge.

Flood in HOOD RIVER, OREGON
From 07-NOV-06 07:00:00 to 07-NOV-06 20:00:00 (PST-8)
Location: HOOD RIVER
Flood cause: Heavy Rain
Property damage: 30.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Hood River near the city of Hood River crested at 14.1 feet on November 7th, with flood stage at 13.0 feet. The flooding and debris flow up river from this gauge caused major damage to Hwy. 35 on Mt. Hood, closing the highway for a month due to repair work.  Moderate damage was also done to irrigation works.

Flood in CLACKAMAS, OREGON
From 07-NOV-06 07:00:00 to 07-NOV-06 20:00:00 (PST-8)
Location: BULL RUN
Flood cause: Heavy Rain
Property damage: 3.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Sandy River near Bull Run crested at flood stage of 19.3 on November 7th.

Flood in TILLAMOOK, OREGON
From 06-NOV-06 07:00:00 to 08-NOV-06 20:00:00 (PST-8)
Location: NEHALEM
Flood cause: Heavy Rain
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Official NWS Observations

The Nehalem River near Foss crested at 19.8 feet on November 7th, with flood stage at 13.5 feet.