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.
These spots are generally caused by a buildup of nitrogen in the soil. Although nitrogen is required to make the lawn green, a lawn burn is a case of too much of a good thing. The nitrogen buildup may be caused by over-fertilizing your lawn, or it may be caused by urine deposits left by pets. No matter what the source of nitrogen burn marks, fixing the discolored lawn is relatively easy.