The selected location is:

The elevation is 701 m ( 2300 ft )
The gradient is: 0.0 percent
There is no aspect direction.
The local roughness is: 0.0 or flat
The location as decimal degrees (X,Y;Z) = -100.7415, 45.0275; 701 m

The state and county are South Dakota: Dewey County 46041
The HUC is Lower Lake Oahe 10130105; Place point in HUC
The Omernik ecoregion is Northwestern Great Plains (more typical) 43
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Nearby named places (in order by distance)

1. No Heart Creek head; -100.7415, 45.0275 at a distance of 2 m
2. East Branch Tall Prairie Chicken Creek head; -100.7635, 45.0347 at a distance of 1910 m
3. Hiett Ranch; South Dakota: Dewey Co. -100.7718, 45.0481 at a distance of 3307 m
4. West Branch Willow Creek head; -100.6954, 45.0264 at a distance of 3634 m
5. C Peterson Number 1 Dam; South Dakota: Dewey Co. -100.6937, 45.0467 at a distance of 4327 m
6. C Peterson Number 3 Dam; South Dakota: Dewey Co. -100.7621, 45.0683 at a distance of 4814 m
7. C Peterson Number 2 Dam; South Dakota: Dewey Co. -100.7704, 45.0683 at a distance of 5072 m
8. R Bartels Number 1 Dam; South Dakota: Dewey Co. -100.7504, 45.0750 at a distance of 5323 m
9. C Peterson Number 4 Dam; South Dakota: Dewey Co. -100.7637, 45.0800 at a distance of 6089 m
10. Little Willow Creek head; -100.6796, 44.9908 at a distance of 6360 m

The 7.5 minute series topographic maps for that area