Seattle Trip, Day 3

Route
Council Bluffs IA to Rapid City SD: I 29 North, SD 50 West, SD 50 Business West to Vermillion SD.
SD 50 Bus East, SD 50 East, I 29 North, I 90 West, I 90 BL (Mitchell) West, I 90 West to Rapid City SD.
I 90 West, I 190 South, local roads, US 16 East, I 190 North, I 90 East
Notes

Construction on I 29 and I 90 for long stretches with two way traffic on one side and no pavement left on the other at all.

Stopped for gas in Mt Vernon SD. Stopped a crossroad a half mile north of I 90 signed "Hwy 16". This would be old US 16 from before it was replaced by I 90 and truncated to Rapid City SD.
Results

Clinched I 29 in IA, I 90 Business Mitchell SD.

Counties: Iowa: 3, South Dakota: 3, for a new total of 960.