Duxbury Reef at Agate Beach County Park, Bolinas
Neither Tom nor I had ever heard of Duxbury Reef so we were intrigued when we saw mention of it. Once we found out where it was – Bolinas, and there were some wonderful tide pools there, we just knew we had to check it out.
If you are going to explore tide pools, then the best time to visit is when there is a low tide. A minus low tide is even better. To find out about tides, you have to consult the time tables. There are a couple online here and here. Consulting the tide tables can be a bit confusing. First you need to know where the nearest tide readings are taken. For Duxbury Reef it is either Point Reyes or Bolinas Lagoon (both of the links will open up in Bolinas Lagoon). Then you look for the date. As we have to visit on a Saturday or Sunday, it narrows our choices considerably. Then you check for time of day you will be visiting and look for a minus sign which denotes a minus tide. One other thing to check, make sure the year is correct. First time around on another site, it was for the year 2006 so I had to search to see how to change the year. The Saturday of our visit the tide was -0.7 at 7.29 a.m. – the lowest early morning weekend tide for the rest of the year.
Saturday morning we were up at 4.15 and on the road by 5. Tom checked the weather so knew we would probably encounter fog. And we certainly did. San Francisco was shrouded with the stuff. Driving across the Golden Gate Bridge the towers were lost to view with only the merest hint of Alcatraz off the the right. Negotiating Highway 1 in the Marin Headlands was a challenge and as we zig-zagged our way along the coast we were aware that the ocean was nearby but only caught odd glimpses of the water through breaks in the fog. The steep drop-offs were passed without my stomach plummeting.
It was gratifying to see that indeed there was a very low tide, especially when we drove past Bolinas Lagoon. Vast mud flats were visible out in the middle. Lots of egrets were paddling in the mud searching for their breakfast.
Just past the end of the lagoon, we turned left towards Bolinas. There aren’t any signs, you have to know that Bolinas is there. At the next junction, where we turned left again, there was a sign which simply said – ‘Entering a socially acknowledged nature-loving town’. This sums up Bolinas.
Of course we checked out where Duxbury Reef was and even looked at a map. It seemed easy enough to find but, you’ve guessed right,
we became a little lost. We took a few wrong turns and ended up a couple of times in a cul-de-sac and once the road was completely closed off due to a landslide. Eventually we returned to Mesa Road and somehow found our way to Elm Road. At the end of Elm Road we turned left onto Ocean Parkway and ran into a fairly large car park at the end of the road. Success, we had reached the right place.
There was just one other car there. I did expect there to be more people around. After all it is the weekend and a minus tide so why weren’t there more people? I can only assume that it is a combination of not many people having heard of Duxbury Reef and it being difficult to find.
A short trail led down to the beach and there in front of us was a large area of exposed tide pools. Only one other person and his dog were in sight. It was a bit chilly on the beach and visibility out to sea was not good but with my hooded sweatshirt on it wasn’t too bad.
I started out to explore the reef. The rocks were covered with slippery seaweed so walking and clambering over them was a slow process. It didn’t matter though as I was not in a great hurry. There were lots of lots of tide pools ranging from tiny crevices to larger expanses of clear water. Negotiating a route to the edge of the ocean was not in a straight line. Some of the inlets were quite large and finding an easy way across at a narrower point or by using stepping stones took time. Of course each tide pool had to be scrutinized as I passed. To get the most out of them, you have to stand very quietly for about five minutes as minute fish swim under cover and tiny crabs scuttle out of sight as you approach. By not moving for a while, they all venture out again and you can then study them.
At first I thought some of molluscs were attached to the rock but then noticed that some of them were moving very, very slowly. Then a tiny leg would appear and then another and I realized that they were hermit crabs. I read a fascinating fact about hermit crabs. As they grow larger they need to move into a bigger shell and a sort of line develops around an empty shell so when one hermit crab exits its too small shell for a larger one, there is already another hermit crab waiting to inhabit the one that had just been vacated. I wonder how they communicate to each other?
I noticed that there were a lot of one sort of mollusk which I couldn’t identify. When writing this post I tried to find out what they were. I can tell you what they weren’t – cockles, mussels, whelks, barnacles or limpets. Comparing our photographs with images online, we think they were sea snails but if anybody out there disagrees, please send a comment. We saw a lot of sea anemones clustered together on the rocks. When they are closed they look very nondescript and uninteresting. Brush against them with your shoe and they tighten up even further. But when they open up they are beautiful. We saw several large green sea anemones waving their tentacles. Don’t be tempted to touch them because they sting.
For most of our time there we had the place to ourselves, then a couple and their four children arrived and were busily exploring the tide pools. The children were fascinated by everything they saw. Not that they were close enough for us to hear what they were saying but could tell by the way they were crouching and pointing excitedly. It was a pleasure to watch them.
While Tom continued to take photos, I walked back up to the beach and wandered further along the sand. As it was called Agate State Beach Park, I was on the lookout for agate. I wasn’t quite sure what agate looked like but that didn’t stop me looking. I don’t think I found any agate but I may have seen a small piece of amethyst in a piece of honeycomb rock. Just wish I’d taken a photo of it. Tom caught up with me and I showed him the rock. He didn’t know whether it was anything to get excited about.
On the way back to the car we took a little detour along a trail that led to the top of the bluffs. We couldn’t see down to the beach very well but we think the reef extends some way down the coast. Perhaps we did not explore all the tide pools. Maybe if we had walked south along the beach we would have discovered more. The trail took us back to the car park.
Time to go and find something to eat . We drove into Bolinas and went into Coast Cafe. We have eaten several times there and like the food. Even though it is a little pricey, the quality of the food and the ambiance is well worth it.
August 04 2010 | Special Places | No Comments »






