On a recent family vacation from Winnemucca, Nevada to Oregon and Washington I decided to break up the trip with a stop at Owyhee Lake to visit the type locality for cavansite. The last reference I could find of anyone visiting the place was a write up by Jon Gladwell. His article was printed in Mineral News, v. 7, no. 3 (March 1991). The locality is within Owyhee Lake State Park in Oregon, but is technically under the jurisdiction of Malheur county, the State of Oregon, and the US Bureau of Reclamation. Gladwell and others obtained permission for limited collecting of specimens at the type locality for scientific purposes and had success in recovering a number of cavansite and (later identified) pentagonite specimens. Their field trip took place in 1990.The location is 2.1 miles by road south of Owyhee Dam. While my kids and wife checked out the park for a bit I took some time to look at the area. The landscape there is composed mainly of ash-rich tuff and the scenery is quite rugged and beautiful. The lake is quite long and stretched out of sight to the southwest. Here and there along the access road there are dikes of andesite(?) cutting up though the tuffs. There is a really interesting glassy dike right at the dam on the east side of the road - possibly a glassy andesite or rhyolite.As you approach the main parking area there is a last left curve and then a downhill incline that takes you to the parking lot. The type locality is the road cut at the curve of the road and also about four hundred feet to the south. We parked at one of the first parking spots in the first main parking area and I walked east into a canyon where I thought the southern part of the cavansite locality might be located. The south side of the canyon was alluvial material that had come down from the slopes and cliffs up to the east of the lake. The north side of the canyon was outcropping tuff. There was a subtle color change in the rocks on the north side of the canyon that suggested there might be a fault there running north toward the curve of the road. I started there. It was only a walk of 100-200 feet from the parking area to get to this spot.There was indeed a fault in the outcrops on the north side of this small canyon. It was exposed in a notch that was higher on the west than on the east. It was pretty steep in there, verging on rock climbing, but I could clearly see calcite veins in the fault zone and in one place the rock was brecciated and had some open vugs with small dull gray tabular calcite crystals in them. There was no cavansite to be seen, but I had not brought a hammer or any collecting equipment because it is a state park. This trip was for my eyes only.I worked my way up the fault zone, which was quite steep in a couple places. The veining in the fault was continuous, but varied considerably in width, locally becoming only a thin veinlet of a few millimeters, and reaching a maximum of about 15cm. As I worked my way up the south side of the hill I had to climb on hands and feet up some steep sections. Toward the top the terrain flattened out somewhat and the fault became covered with shallow overburden of the same rock type. For about forty meters I could only find pieces of loose calcite vein, in some cases with tiny pearly crystals of what I thought might be heulandite. Further north on the top of the hill I could no longer find traces of the veinlets in the surface float.Descending the north side of the hill brought me to the road cut where Cavansite was first discovered, and where Gladwell's field trip had located specimens. Much of the base of the road cut was covered with material that had sloughed down upon it, but there were numerous calcite veins in a variety of orientations present within the outcrop. The single fault I had followed from the south side of the hill had apparently broadened into a zone consisting of numerous intersecting faults. Some veins intersected this zone at a high angle, suggesting the possible involvement of an additional fault or fracture set.I spent a little while looking over the whole road cut and examining the veins there. I did not find any cavansite or other obvious zeolites, but I was not certain which fault or vein was the mineralized one that Gladwell visited successfully. What I found were the same small, dull calcite crystals as I had seen to the south. I also went across the road from the road cut to a pile of rocks that had been pushed down the slope below the road. It looked like material that had been pushed out of the road cut during road construction. I saw very little of interest in this material.After this excursion I rejoined my family and we enjoyed the scenery of the lake and surrounding cliffs together. Owyhee Lake is quite beautiful, but I think a boat would be needed to fully appreciate its charms. It was also a great experience to locate the cavansite area and have a look around. My impression was that some more exploring in this area might turn up other veins or interesting occurrences. It seems all the focus at this park is on the lake and very few hiking trails or exploring opportunities have been developed. This might be due in part to the steep and rugged nature of the surroundings, but in moderate weather I think the place would be a fine one for hiking around.