California roads before 1896 we mostly built by towns, cities, counties, or in many cases, private individuals or companies. There were no state highways or roads until 1896, when the Lake Tahoe Wagon Road in El Dorado County became the first. It was built by private funds, then run by the county, and finally taken over by the state.
The early state highway "right of way" was often less than accurate, using surveying techniques that relied on trees, buildings, rocks, or other objects to determine the road property boundaries. What was needed was a permanent, uniform marker that would act as a survey point. Enter the California "C" Marker.
These concrete markers, used from 1914 to 1934, would be placed at curves, intersections, and regular intervals along straightaways. The posts are 6" x 6" x 42" long. The top 6 to 8 inches projects above the ground and is what we see today, in most cases. There is also a 3/16"x6" copper wire set at the top to show the exact angle to measure. You can see it in the photo below.
You can still see these markers along many old state roads that are today county or city roads. We will find them when following the old Lincoln Highway through El Dorado and Placer Counties. The photo below shows one on Sisley Road in Penryn, which, back before the construction of Highway 40 nearby was the Lincoln Highway. While the Lincoln Highway was a transcontinental route, each state the highway passed through was responsible for that part of the road.
Shown in the photo below in El Dorado County, along the old Lincoln Highway route, at Forni and Highway 49, is this one painted. We could find no evidence that the State of California ever painted the markers. Looks cool, and it's nice to see the homeowner take notice.
It's not just the Lincoln Highway with the markers, but many of the old state highways. When we search for lost alignments of the Lincoln Highway or other state highways, coming upon one of these markers helps determine we're on the right track. The photo below shows a beat-up one at the Cronin Ranch at Pedro Hill, the old Highway 49 route through Pilot Hill before the road was re-aligned.
Keep your eyes open for these old markers. Usually placed about 15 feet from the center of the old road, especially near curves in the old road. You never know who might join you in your search for "C" markers.