| 1 | North Pigeon Cr Watershed Site 11-1 | Pottawattamie | 81 | Low | Not Rated | 1978 |
| 2 | Waubonsie Cr. Watershed Site 3-8 | Mills | 69 | Significant | Satisfactory | 1989 |
| 3 | Croy Subwatershed Site M-10500 | Monona | 67 | Low | Not Rated | 1952 |
| 4 | Horse Lake Dam | Plymouth | 67 | Significant | Satisfactory | 1963 |
| 5 | Iris Lake Dam | Fayette | 66 | Low | Satisfactory | 2004 |
| 6 | Waubonsie Cr. Watershed Site 3-11 | Mills | 66 | Low | Not Rated | 1989 |
| 7 | North Pigeon Cr Watershed Site 17 | Pottawattamie | 66 | Low | Not Rated | 1973 |
| 8 | West Beaver Subwatershed Sta 23+45 #a | Monona | 65 | Low | Not Rated | 1961 |
| 9 | North Pigeon Cr Watershed Site 15 | Pottawattamie | 65 | Low | Not Rated | 1978 |
| 10 | Pony Creek Watershed Site 23 | Mills | 64 | Low | Not Rated | 1964 |
| 11 | Upper Beaver Subwatershed Site 6-1 | Monona | 64 | Low | Not Rated | 1967 |
| 12 | North Pigeon Cr Watershed Site 13 | Pottawattamie | 64 | Low | Not Rated | 1978 |
| 13 | Doran Dam | Boone | 63 | Low | Not Rated | 1971 |
| 14 | Indian Creek Watershed Site 12 | Pottawattamie | 63 | Low | Not Rated | 1975 |
| 15 | Boustead/coenen/pryor Dam | Harrison | 62 | Low | Not Rated | 1965 |
| 16 | Pony Creek Watershed Site 8a | Mills | 62 | Low | Not Rated | 1966 |
| 17 | Pony Creek Watershed Site 17 | Mills | 62 | Low | Satisfactory | 1965 |
| 18 | Mill Picayune Watershed Site M-2-1 | Harrison | 61 | Low | Not Rated | 1967 |
| 19 | Pony Creek Watershed Site 9 | Mills | 60 | Low | Not Rated | 1967 |
| 20 | Pony Creek Watershed Site 10 | Mills | 60 | Significant | Satisfactory | 1966 |
| 21 | Andresen/coberly Dam | Monona | 60 | Low | Not Rated | 1977 |
| 22 | Upper Beaver Subwatershed Site M-1 | Monona | 60 | Low | Poor | 1967 |
| 23 | Davis-battle Cr. Watershed Site C-12-1 | Monona | 60 | Low | Not Rated | 1964 |
| 24 | North Pigeon Cr Watershed Site 9 | Pottawattamie | 60 | Low | Not Rated | 1978 |
| 25 | Lauman Dam | Fremont | 59 | Low | Not Rated | 1959 |
| 26 | Dunham Dam | Crawford | 58 | Low | Not Rated | 1970 |
| 27 | Samuels Dam | Madison | 58 | Low | Not Rated | 1960 |
| 28 | Davis-battle Cr. Watershed Site E-1 | Monona | 58 | Low | Not Rated | 1969 |
| 29 | Gant Creek Watershed Site A-5 | Plymouth | 58 | Low | Not Rated | 1969 |
| 30 | North Pigeon Cr Watershed Site M-3 | Pottawattamie | 58 | Low | Not Rated | 1985 |
| 31 | Little Egypt Subwatershed 4-2772 | Woodbury | 58 | Low | Not Rated | 1961 |
| 32 | Weatherly/haight Dam | Harrison | 57 | Low | Not Rated | 1967 |
| 33 | South Magnolia Watershed Site 1 | Harrison | 57 | Low | Not Rated | 1958 |
| 34 | Savery/welliver Dam | Monona | 57 | Low | Fair | 1966 |
| 35 | North Pigeon Cr Watershed Site 4-1 | Pottawattamie | 57 | Low | Not Rated | 1971 |
| 36 | Timber Lakes Estate Dam | Scott | 57 | Significant | Not Rated | 2000 |
| 37 | Mc Call Subwatershed Site M-1 | Monona | 56 | Low | Not Rated | 1963 |
| 38 | Leech Hollow Subwatershed Site C-2 | Monona | 56 | Low | Not Rated | 1978 |
| 39 | North Pigeon Cr Watershed Site 12-1 | Pottawattamie | 56 | Low | Not Rated | 1978 |
| 40 | Schwertley Dam | Harrison | 55 | Low | Not Rated | 1959 |
| 41 | West Fork #3 Subwtrshd Sta 37+14 #9 | Woodbury | 55 | Low | Not Rated | 1961 |
| 42 | Waubonsie Cr. Watershed Site 23-2 | Mills | 54 | Low | Not Rated | 1979 |
| 43 | Upper Beaver Subwatershed Site 15-1 | Monona | 54 | Low | Not Rated | 1966 |
| 44 | Held Watershed Site A-1 | Plymouth | 54 | Low | Not Rated | 1965 |
| 45 | West Sunnyside Watershed Site C-3 | Plymouth | 54 | Low | Not Rated | 1973 |
| 46 | Twin Ponies Watershed Site 17a | Pottawattamie | 54 | Low | Satisfactory | 1998 |
| 47 | Indian Creek Watershed Site 26 | Pottawattamie | 54 | Low | Not Rated | 1975 |
| 48 | Davis Subwatershed 7-3615 | Woodbury | 54 | Low | Not Rated | 1958 |
| 49 | Parnell Creek Subwatershed Site 8-1 | Woodbury | 54 | Low | Not Rated | 1968 |
| 50 | Pony Creek Watershed Site 11 | Mills | 53 | Low | Not Rated | 1963 |
| 51 | Waubonsie Cr. Watershed Site 37-1 | Mills | 53 | Low | Not Rated | 1983 |
| 52 | Waubonsie Cr. Watershed Site 36-2 | Mills | 53 | Low | Not Rated | 1983 |
| 53 | Waubonsie Cr. Watershed Site 23-3 | Mills | 53 | Significant | Satisfactory | 1987 |
| 54 | Iowa Noname33 | Monona | 53 | Low | Not Rated | 1966 |
| 55 | Phillips Subwatershed Site 3250 | Monona | 53 | Low | Not Rated | 1956 |
| 56 | Rodney Subwatershed Site 8-1 | Monona | 53 | Low | Not Rated | 1969 |
| 57 | Indian Creek Watershed Site 39 | Pottawattamie | 53 | Low | Not Rated | 1975 |
| 58 | Mill Picayune Watershed Site P-90-1 | Shelby | 53 | Low | Not Rated | 1984 |
| 59 | Dane Ridge Watershed Site A | Crawford | 52 | Low | Not Rated | 1977 |
| 60 | Midwest Oilseed Dam #2 | Dallas | 52 | Low | Not Rated | 2002 |
| 61 | Bohlen Dam | Des Moines | 52 | Low | Not Rated | 1985 |
| 62 | Olsen Dam | Harrison | 52 | Low | Not Rated | 1961 |
| 63 | Mosquito Of Harrison Watershed Site 5-1 | Harrison | 52 | Low | Not Rated | 1985 |
| 64 | Olson/mann Dam | Monona | 52 | Low | Not Rated | 1959 |
| 65 | Leech Hollow Subwatershed Site C-12 | Monona | 52 | Low | Not Rated | 1978 |
| 66 | Davis-battle Cr. Watershed Site H-4-1 | Monona | 52 | Low | Not Rated | 1963 |
| 67 | Leekly Dam | Plymouth | 52 | Low | Not Rated | 1968 |
| 68 | Gant Creek Watershed Site C-6 | Plymouth | 52 | Low | Not Rated | 1974 |
| 69 | West Sunnyside Watershed Site C-4 | Plymouth | 52 | Low | Not Rated | 1973 |
| 70 | Indian Creek Watershed Site 4 | Pottawattamie | 52 | Low | Not Rated | 1965 |
| 71 | Davis Subwatershed 19-2044 | Woodbury | 52 | Low | Not Rated | 1958 |
| 72 | Sunrise Subwatershed Site 6a-1 | Woodbury | 52 | Low | Not Rated | 1973 |
| 73 | Windy Hill Subwatershed Site 5-3 | Woodbury | 52 | Low | Not Rated | 1975 |
| 74 | Midwest Oilseeds Dam | Dallas | 51 | Low | Not Rated | 2000 |
| 75 | Mill Picayune Watershed Site P-39-1 | Harrison | 51 | Low | Not Rated | 1989 |
| 76 | Mill Picayune Watershed Site S-10-1 | Harrison | 51 | Low | Not Rated | 1962 |
| 77 | Waubonsie Cr. Watershed Site 3-5 | Mills | 51 | Low | Not Rated | 1989 |
| 78 | Waubonsie Cr. Watershed Site 3-2 | Mills | 51 | Low | Not Rated | 1993 |
| 79 | Reed Subwatershed Sta 71+10 | Monona | 51 | Low | Not Rated | 1966 |
| 80 | Upper Beaver Subwatershed Site 20-1 | Monona | 51 | Low | Not Rated | 1967 |
| 81 | Reed Subwatershed Sta 45+25 #4 | Monona | 51 | Low | Not Rated | 1966 |
| 82 | U-b Subwatershed Site 2-2 | Monona | 51 | Low | Not Rated | 1962 |
| 83 | Leech Hollow Subwatershed Site C-5 | Monona | 51 | Low | Not Rated | 1978 |
| 84 | Barber Hollow Subwatershed Site 5-1 | Monona | 51 | Low | Not Rated | 1966 |
| 85 | Davis-battle Cr. Watershed Site H-4-4 | Monona | 51 | Low | Not Rated | 1966 |
| 86 | North Pigeon Cr Watershed Site M-4 | Pottawattamie | 51 | Low | Not Rated | 1971 |
| 87 | Mill Picayune Watershed Site P-92-1 | Shelby | 51 | Low | Not Rated | 1984 |
| 88 | Mill Picayune Watershed Site M-24-5 | Shelby | 51 | Low | Not Rated | 1963 |
| 89 | Mill Picayune Watershed Site M-24-4 | Shelby | 51 | Low | Not Rated | 1963 |
| 90 | Walling Subwatershed Sta 57+84 #1b | Woodbury | 51 | Low | Not Rated | 1953 |
| 91 | Dane Ridge Watershed Site D-1-3 | Crawford | 50 | Low | Not Rated | 1971 |
| 92 | Mosquito Of Harrison Watershed Site 7-1 | Harrison | 50 | Low | Not Rated | 1993 |
| 93 | Lake Pahoja Dam | Lyon | 50 | Significant | Satisfactory | 1974 |
| 94 | Waubonsie Cr. Watershed Site 31-1 | Mills | 50 | Low | Not Rated | 1983 |
| 95 | Waubonsie Cr. Watershed Site 3-6 | Mills | 50 | Low | Not Rated | 1989 |
| 96 | Phillips Subwatershed Site 5740 | Monona | 50 | Low | Not Rated | 1956 |
| 97 | Mike Mikkelson Subwatershed 5-5020 | Monona | 50 | Low | Not Rated | 1970 |
| 98 | Huff Subwatershed Sta 77+72 #1 | Monona | 50 | Low | Not Rated | 1963 |
| 99 | Iowa Noname36 | Plymouth | 50 | Low | Not Rated | 1965 |
| 100 | North Pigeon Cr Watershed Site 16 | Pottawattamie | 50 | Low | Not Rated | 1978 |