Location: Corvallis, Oregon ▪ Colors: Orange & Black
Record: 112 Years, 1669-1241, .574 W-L%
Conferences: Pac-12, Pac-10, Pac-8, AAWU, PCC and Ind
Conference Champion: 12 Times (Reg. Seas.), 0 Times (Tourn.)
NCAA Tournament: 16 Years (12-19), 2 Final Fours, 0 Championships
Ranked in AP Poll: 6 Times (Preseason), 8 Times (Final), 128 Weeks (Total)
| Rk | Year | Wk | Date | Rk | Prev | Chng |
|---|---|---|---|---|---|---|
| 1 | 1990 | 3 | 1989-12-05 | 24 | |
|
| 2 | 1990 | 4 | 1989-12-12 | 23 | 24 | 1 |
| 3 | 1990 | 5 | 1989-12-19 | 21 | 23 | 2 |
| 4 | 1990 | 6 | 1989-12-26 | 23 | 21 | 2 |
| 5 | 1990 | 7 | 1990-01-02 | 23 | 23 | NC |
| 6 | 1990 | 8 | 1990-01-09 | 22 | 23 | 1 |
| 7 | 1990 | 9 | 1990-01-16 | 18 | 22 | 4 |
| 8 | 1990 | 10 | 1990-01-23 | 17 | 18 | 1 |
| 9 | 1990 | 11 | 1990-01-30 | 21 | 17 | 4 |
| 10 | 1990 | 12 | 1990-02-06 | 18 | 21 | 3 |
| 11 | 1990 | 13 | 1990-02-13 | 16 | 18 | 2 |
| 12 | 1990 | 14 | 1990-02-20 | 17 | 16 | 1 |
| 13 | 1990 | 15 | 1990-02-27 | 16 | 17 | 1 |
| 14 | 1990 | 16 | 1990-03-06 | 22 | 16 | 6 |
| 15 | 1990 | 17 | Final | 22 | 22 | NC |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 16 | 1985 | 8 | 1985-01-08 | 20 | |
|
| 17 | 1985 | 9 | 1985-01-15 | 14 | 20 | 6 |
| 18 | 1985 | 10 | 1985-01-22 | 10 | 14 | 4 |
| 19 | 1985 | 11 | 1985-01-29 | 14 | 10 | 4 |
| 20 | 1985 | 12 | 1985-02-05 | 16 | 14 | 2 |
| 21 | 1985 | 13 | 1985-02-12 | 18 | 16 | 2 |
| 22 | 1985 | 14 | 1985-02-19 | 19 | 18 | 1 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 23 | 1984 | 1 | Preseason | 10 | NA | — |
| 24 | 1984 | 2 | 1983-11-29 | 10 | 10 | NC |
| 25 | 1984 | 3 | 1983-12-06 | 18 | 10 | 8 |
| 26 | 1984 | 4 | 1983-12-13 | 14 | 18 | 4 |
| 27 | 1984 | 5 | 1983-12-20 | 15 | 14 | 1 |
| 28 | 1984 | 6 | 1983-12-27 | 19 | 15 | 4 |
| 29 | 1984 | 7 | 1984-01-03 | 15 | 19 | 4 |
| 30 | 1984 | 8 | 1984-01-10 | 16 | 15 | 1 |
| 31 | 1984 | 9 | 1984-01-17 | 11 | 16 | 5 |
| 32 | 1984 | 14 | 1984-02-21 | 20 | |
|
| 33 | 1984 | 15 | 1984-02-28 | 20 | 20 | NC |
| 34 | 1984 | 16 | 1984-03-06 | 20 | 20 | NC |
| 35 | 1984 | 17 | Final | 17 | 20 | 3 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 36 | 1983 | 1 | Preseason | 10 | NA | — |
| 37 | 1983 | 2 | 1982-11-30 | 19 | 10 | 9 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 38 | 1982 | 3 | 1981-12-08 | 19 | |
|
| 39 | 1982 | 4 | 1981-12-15 | 20 | 19 | 1 |
| 40 | 1982 | 5 | 1981-12-22 | 16 | 20 | 4 |
| 41 | 1982 | 6 | 1981-12-29 | 15 | 16 | 1 |
| 42 | 1982 | 7 | 1982-01-05 | 17 | 15 | 2 |
| 43 | 1982 | 8 | 1982-01-12 | 15 | 17 | 2 |
| 44 | 1982 | 9 | 1982-01-19 | 12 | 15 | 3 |
| 45 | 1982 | 10 | 1982-01-26 | 8 | 12 | 4 |
| 46 | 1982 | 11 | 1982-02-02 | 10 | 8 | 2 |
| 47 | 1982 | 12 | 1982-02-09 | 6 | 10 | 4 |
| 48 | 1982 | 13 | 1982-02-16 | 5 | 6 | 1 |
| 49 | 1982 | 14 | 1982-02-23 | 4 | 5 | 1 |
| 50 | 1982 | 15 | 1982-03-02 | 4 | 4 | NC |
| 51 | 1982 | 16 | Final | 4 | 4 | NC |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 52 | 1981 | 1 | Preseason | 7 | NA | — |
| 53 | 1981 | 2 | 1980-12-02 | 6 | 7 | 1 |
| 54 | 1981 | 3 | 1980-12-09 | 5 | 6 | 1 |
| 55 | 1981 | 4 | 1980-12-16 | 4 | 5 | 1 |
| 56 | 1981 | 5 | 1980-12-23 | 4 | 4 | NC |
| 57 | 1981 | 6 | 1980-12-30 | 2 | 4 | 2 |
| 58 | 1981 | 7 | 1981-01-06 | 2 | 2 | NC |
| 59 | 1981 | 8 | 1981-01-13 | 1 | 2 | 1 |
| 60 | 1981 | 9 | 1981-01-20 | 1 | 1 | NC |
| 61 | 1981 | 10 | 1981-01-27 | 1 | 1 | NC |
| 62 | 1981 | 11 | 1981-02-03 | 2 | 1 | 1 |
| 63 | 1981 | 12 | 1981-02-10 | 2 | 2 | NC |
| 64 | 1981 | 13 | 1981-02-17 | 2 | 2 | NC |
| 65 | 1981 | 14 | 1981-02-24 | 1 | 2 | 1 |
| 66 | 1981 | 15 | 1981-03-03 | 1 | 1 | NC |
| 67 | 1981 | 16 | Final | 2 | 1 | 1 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 68 | 1980 | 1 | Preseason | 17 | NA | — |
| 69 | 1980 | 2 | 1979-12-04 | 15 | 17 | 2 |
| 70 | 1980 | 3 | 1979-12-11 | 14 | 15 | 1 |
| 71 | 1980 | 4 | 1979-12-18 | 19 | 14 | 5 |
| 72 | 1980 | 5 | 1979-12-26 | 18 | 19 | 1 |
| 73 | 1980 | 6 | 1980-01-02 | 14 | 18 | 4 |
| 74 | 1980 | 7 | 1980-01-08 | 9 | 14 | 5 |
| 75 | 1980 | 8 | 1980-01-15 | 4 | 9 | 5 |
| 76 | 1980 | 9 | 1980-01-22 | 2 | 4 | 2 |
| 77 | 1980 | 10 | 1980-01-29 | 2 | 2 | NC |
| 78 | 1980 | 11 | 1980-02-05 | 4 | 2 | 2 |
| 79 | 1980 | 12 | 1980-02-12 | 4 | 4 | NC |
| 80 | 1980 | 13 | 1980-02-19 | 6 | 4 | 2 |
| 81 | 1980 | 14 | 1980-02-26 | 6 | 6 | NC |
| 82 | 1980 | 15 | Final | 5 | 6 | 1 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 83 | 1976 | 8 | 1976-01-13 | 17 | |
|
| 84 | 1976 | 9 | 1976-01-20 | 13 | 17 | 4 |
| 85 | 1976 | 10 | 1976-01-27 | 16 | 13 | 3 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 86 | 1975 | 12 | 1975-02-11 | 17 | |
|
| 87 | 1975 | 13 | 1975-02-18 | 20 | 17 | 3 |
| 88 | 1975 | 14 | 1975-02-25 | 17 | 20 | 3 |
| 89 | 1975 | 15 | 1975-03-04 | 15 | 17 | 2 |
| 90 | 1975 | 16 | 1975-03-11 | 15 | 15 | NC |
| 91 | 1975 | 17 | 1975-03-18 | 13 | 15 | 2 |
| 92 | 1975 | 19 | Final | 18 | |
|
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 93 | 1971 | 7 | 1971-01-12 | 20 | |
|
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 94 | 1964 | 1 | Preseason | 10 | NA | — |
| 95 | 1964 | 2 | 1963-12-10 | 9 | 10 | 1 |
| 96 | 1964 | 4 | 1963-12-24 | 9 | |
|
| 97 | 1964 | 5 | 1963-12-31 | 8 | 9 | 1 |
| 98 | 1964 | 6 | 1964-01-07 | 6 | 8 | 2 |
| 99 | 1964 | 7 | 1964-01-14 | 7 | 6 | 1 |
| 100 | 1964 | 8 | 1964-01-21 | 10 | 7 | 3 |
| 101 | 1964 | 11 | 1964-02-11 | 9 | |
|
| 102 | 1964 | 12 | 1964-02-18 | 7 | 9 | 2 |
| 103 | 1964 | 13 | 1964-02-25 | 6 | 7 | 1 |
| 104 | 1964 | 14 | 1964-03-03 | 6 | 6 | NC |
| 105 | 1964 | 15 | Final | 6 | 6 | NC |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 106 | 1963 | 1 | Preseason | 7 | NA | — |
| 107 | 1963 | 2 | 1962-12-04 | 7 | 7 | NC |
| 108 | 1963 | 3 | 1962-12-11 | 9 | 7 | 2 |
| 109 | 1963 | 8 | 1963-01-15 | 10 | |
|
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 110 | 1962 | 9 | 1962-02-06 | 10 | |
|
| 111 | 1962 | 10 | 1962-02-13 | 6 | 10 | 4 |
| 112 | 1962 | 11 | 1962-02-20 | 10 | 6 | 4 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 113 | 1958 | 2 | 1957-12-17 | 17 | |
|
| 114 | 1958 | 4 | 1957-12-31 | 18 | |
|
| 115 | 1958 | 5 | 1958-01-07 | 15 | 18 | 3 |
| 116 | 1958 | 6 | 1958-01-14 | 16 | 15 | 1 |
| 117 | 1958 | 8 | 1958-01-28 | 20 | |
|
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 118 | 1955 | 9 | 1955-02-01 | 19 | |
|
| 119 | 1955 | 10 | 1955-02-08 | 18 | 19 | 1 |
| 120 | 1955 | 11 | 1955-02-15 | 16 | 18 | 2 |
| 121 | 1955 | 13 | 1955-03-01 | 14 | |
|
| 122 | 1955 | 14 | Final | 10 | 14 | 4 |
| Rk | Year | Wk | Date | Rk | Prev | Chng |
| 123 | 1954 | 1 | 1953-12-08 | 13 | NA | — |
| 124 | 1954 | 2 | 1953-12-15 | 11 | 13 | 2 |
| 125 | 1954 | 3 | 1953-12-22 | 12 | 11 | 1 |
| 126 | 1954 | 4 | 1953-12-29 | 4 | 12 | 8 |
| 127 | 1954 | 5 | 1954-01-05 | 10 | 4 | 6 |
| 128 | 1954 | 14 | 1954-03-09 | 16 | |