On our vacation in July. One of the places we went to was Chimney Rock National Monument near Pagosa Springs, Colorado. We didn’t know what was there but off we went.
The heart of the monument are these two rocks. I am thinking the one on the right is, Chimney Rock (I think), and the one on the left is Monument Rock. The rocks themselves are very impressive but their claim to fame is that they were an important part of an ancient lunar observatory that monitored the 18.6 year cycle of the Major Lunar Standstill. The lunar cycle is a lot more complex than the solar cycle for various reasons. When the moon reached is maximum height every 18.6 years, you could see it nestled in between the two rocks.
The last time this happened was in 2025. Rather than steal a photo to show you, here is a link by Rocky Mountain Public Broadcasting Service showing a photo of the event. Below is a short video by the US Forest Service describing what the event is, how it occurs, and its importance to the various Tribes who are the descendants of the original residents.
The thinking is that Chimney Rock was originally built by Ancestral Puebloan people and then was later an outlier for Chacoan people who used the observatory for agricultural and religious purposes.
Heather getting ready.
After checking in at the Visitor Center and showing our pass we drove the road up to the parking lot at the ridge and then grabbed out hiking sticks, water, and laced out hiking shoes on.
Son Logan is ready to go.
It is a short but steep hike from the parking lot.
And then it got very steep and rocky. Watch your step. It was also hot that day.
A view back down the trail and off to one side. Beautiful vistas.
The partially reconstructed observatory. They used about two million stones to build it. All of them had to be hauled up from the valley floor by hand along with food and water for the work force. The guides said that there was some agriculture and some water from rainfall up on the ridge that they impounded by a series of dams.
Here’s the closest that we could get. Those flat rocks above the step once supported a Forest Service Fire Lookout tower that was removed in 2010. The site was opened to the public a couple years later.
So I moved off to the side and used my telephoto lens to get this view.
You can see why this would be a great place for a fire lookout tower. You can see everywhere.
We went back down the steep rocky trail to the car and drove down into the valley.
They have a small but very nice visitor center. The Forest Service partners with 26 tribes who trace ancestors to the area. They help govern the area and make sure their ancestors are honored and that their treaty rights to the area are preserved to the full extent of the law. I found the whole arrangement fascinating.
I am also fascinated by the amount of information now available. The Ancient Puebloan and Chacoan Cultures did not have a written language so the information we have is from archeological research including reinterpretation of data from past excavations. The modern ethic seems to be to limit new excavations and use old data to the maximum extent possible. They also seem to give much weight to the stories and history as told by the elders in Tribes today.
Here is some information from the Chimney Rock Interpretive Associations. And the US Forest Service also has information.
I am linking to Skywatch Friday.






































































