Z05463090 USGS H05463090 4222100924605001919075SW0708020556.9 970 N05463090 Black Hawk Creek at Grundy Center, IA Y05463090 305463090 19660209 4900 87.46 305463090 19670612 310 83.18 305463090 1968 3004Bm 305463090 19690708 7000 89.60 305463090 1970 3004Bm 305463090 19710524 1080 85.74 305463090 19720806 1800 86.71 305463090 19730417 2000 87.84 305463090 19740622 1950 87.72 305463090 19750428 1150 85.82 305463090 19760313 2200 87.59 305463090 1977 1104Bm 305463090 19780320 5102 85.76 305463090 19790419 3300 87.92 305463090 19800601 1700 86.46 305463090 19810624 960 85.56 305463090 19820615 1200 85.90 305463090 19830519 2250 87.94 305463090 19840710 1100 86.44 305463090 1985 78.04Bm 305463090 19860319 1100 86.63 305463090 1987 78.04Bm 305463090 1988 78.04Bm 305463090 1989 78.04Bm 305463090 19900520 1690 87.28 305463090 19910601 4390 88.71