Final answer:
The style of roof on the front portion of the Old Minnehaha County Jail is not specified in the provided information, which discusses various historical roof styles.
Step-by-step explanation:
The Old Minnehaha County Jail's front portion roof style is not explicitly mentioned in the provided reference materials. However, the information provided describes different roof styles that have been prominent in history, such as the sharply pitched roofs of long houses and the asymmetrical roofline known as a Salt Box House. To answer the question accurately, one would ideally refer to resources specific to the Old Minnehaha County Jail or the architectural history of the region for details on the jail's design.