Hopefully nothing to hard, and maybe a little history on the way.
Travel across Iowa’s terrain was difficult at best in the early 1800’s. The only “roads” were paths worn by oxen drawn wagons. Roads became a necessity in Eastern Iowa in the 1830’s when the area began to see a steady population expansion. In 1830, about 50 people inhabited this area and within 8 years, the population had grown to more than 43,000. Iowa gained its territorial status in 1838. Congress recognized the need for roads but some members were reluctant. The supporters of the federal road program discovered that they could win over the opposition by designating their proposals as “military roads” to aide soldiers in transportation of supplies. In 1839, legislation was passed appropriating $20,000 for Iowa’s first federal military road from the mining and river town of Dubuque to the Missouri border in Van Buren County. The language in the legislation required the road to travel through as many county seats as possible.
The Langworthy brothers (Edward, James and Lucius) of Dubuque were hired as the contractors for the road and work began to complete the road at the same time the capital building in Iowa City was being erected. The furrow is mostly under the route of present day Highway 1 from Iowa City to Anamosa and Highway 151 from Anamosa to Dubuque. Although the military never made formal use of the “Military Road (sometimes referred to as “National Road”),the road was very important to the expansion of the Eastern Iowa areas and to the survival of the towns that were located along its path, including the town of Cascade.
The cache is located near the marker for the road that's I'd driven past 100 times, and never noticed. Parking is tough, but it should be a quick grab.