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Whole-record test
Flood hazard on Potato Creek at North Liberty is mapped and real; a dated crest is not in the reached record, and none is asserted. The FEMA Flood Insurance Study for St. Joseph County (preliminary 30 January 2026, read in full text) makes Potato Creek a studied flooding source through the town: its Table 2 lists the community "Town of North Liberty / St. Joseph County unincorporated areas," reach "downstream corporate limits to upstream corporate limits," 2.5 miles, Zone AE, analysis 2015; the town's flood zones are A, AE and X. The 2015 Comprehensive Plan notes the town limits include extensive floodplain for the creek on the north side of town, and the North Liberty Park nomination places the park in the creek's flood plain. And the same FEMA study's Table 5, Principal Flood Problems, contains only a St. Joseph River entry — no Potato Creek dated flood problem — while its Table 6, Historic Flooding Elevations, reads "[Not Applicable to this Flood Risk Project]." Settlers: the town paper's film run for any reported crest; the USGS record for the creek station upstream of SR 23, which carries only discrete water-quality samples (2004) and no continuous gage record.