For much of the way, Imperial Highway is signed as State Route 90. A de facto freeway portion of the route in Yorba Linda is also known as the Richard M. Nixon Parkway. The portion in Los Angeles County is located about one mile north of, and runs parallel to, Rosecrans Avenue.
Are areas of your lawn bumpy and uneven? When you walk across these areas does the soil sink or feel soft? If so, some type of soil dwelling critter is probably the cause. During winter the activity of moles, earthworms, and mole crickets can cause mounds and tunnels in lawns that result in uneven or rough patches. To fix these problem areas you must first diagnose which critter is causing the damage. Earthworms.
The cone-shaped mounds moles leave on the surface of the ground, often called molehills, most often contain coarse soil and earth clods. Moles do not usually build numerous mounds. Mounds are constructed as a mole digs a deep run and pushes soil up through the center, much as a volcano is formed (Figure 3).