- U.S. Lamprey Experiment Station, Hammond Bay1
- U.S.-2 and Hog Island Creek.1
- U.S.-60, ½ mi. W. U.S. 27.1
- UM Flint Campus at Flint River; behind University Center1
- UMBS1
- US 31, westside 0.2 mi North of M-201
- US Highway 23, near Oscoda1
- US-12 & M-77, near jct1
- US-131, ca. 4.5 mi. NE of Alba.1
- US-2 around Gros Cap, St. Ignace.1
- US-31 ROW north of St. Joseph River.1
- US2 between Manistique and Thompson1
- USA36,427
- USFS 3139 (Dick Rd.) SE of hilltop where 89080 comes from.1
- USFS land, Pine Lake Research Natural Area, ca. 0.25 mi south of Raymond Road.1
- Unadilla3
- Under a clump of willows in low shrubby old field along Kawkawlin River; west side of sect. 15, T16N, R2E1
- Under power lines ½ mi. S.W. of the McKinley bridge ca. 8 mi. E. of town of Mio. Mentor Twp.1
- Under public dock at Harbor Springs, Little Traverse Bay1
- Under railroad trestle n. of Wolf Cr., e. of Bent Oak Hwy., Adrian.1