Noah often went to Grand Coulee not only because it was the closest place of business as explained in my post, but also because 2 of his sisters lived there. The following is from my post, 1911 Courtship: Apr 17 Dear Ethel:
This map shows the distance between Noah's farm (near Adams) to Grand Coulee, a distance of 5.8 km (3.6 miles). And it's 20.5 km (13 miles) from Adams to Regina's Union Station (near red dot).
The hamlet of Adams was one of many grain elevator stops on the old CNR line which passed through part of Noah's land, however, at the time of these letters in 1911, the nearest Post Office was in Grand Coulee which is why Noah used it as his address.