The Denny Regrade wasn't the only radical reshaping of Seattle's topography in this period. Crews may also regrade slopes, further destroying colonies. For example, the Denny Regrade in Seattle was largely accomplished by hydraulic mining. The result was Denny Regrade No. 2, begun in February 1929 and lasting 22 months. Such a project can also be referred to as a regrade. The First Avenue regrade was started in 1897 and completed on January 6, 1899. Officials decided to regrade the entire road for double track, but only lay of rail. The slightly earlier Jackson Regrade had already reshaped Pioneer Square and the International District.