Diamond Creek is such a personal creation and idiosyncratic operation that it’s hard to image without Al Brounstein or his family, but with no third generation to take over, it was sold to Roederer in 2020. No one had planted vineyards this far north in the mountains when Al purchased forested land on Diamond Mountain to create a vineyard in 1968. Vineyards were planted with Bordeaux varieties smuggled across the border (fortunately on St. George rootstock, against conventional wisdom, so they have survived phylloxera and there are many original gnarled old vines on the property).
Way up Diamond Creek road, well into the mountain, the estate has four individual vineyards, all with roughly the same blend of Cabernet Sauvignon, Merlot, and Cabernet Franc; Petit Verdot comes from a separate plot nearby. All replanting is based on propagation of vines from the original selection. There are no plans to change or expand production. The vineyard management and winemaking team at Diamond Creek stayed on, although winemaker Phil Steinschriber later retired and Graham Wehmeier came from Futo to take over. The main change in the immediate future is a ten-year plan for some replanting.
The contemporary winery sits at a high point looking over Red Rock Terrace, immediately below and facing to the north, with Volcanic Hill opposite, with the slope facing full south. Gravelly Meadow is to one side, and Lake is a very small vineyard to the other side. Next to Lake is the plot of Petit Verdot that is used for all the wines. Lake is the coolest site of all, and makes a wine only in some vintages; after that, Gravelly Meadow is the coolest, and Volcanic Hill is distinctly warmer. Indeed, going round the property, the extra warmth hits you as you go up Volcanic Hill. Soils are distinct, ferrous for red rock, gravel for Gravelly Meadow, and volcanic ash for Volcanic Hill. Harvest starts at Volcanic Hill in September, and ends several weeks later in Lake. Production is small, around 500 cases each, except for only 100 cases of Lake when it is made. The wines age for 21 months in all new French oak. The blends are all similar, with 76-78% Cabernet Sauvignon, and then Merlot, Malbec, and Petit Verdot in decreasing amounts.
Tasting the 2018s soon after release, Red Rock shows as most forward and approachable, with Gravelly Meadow close behind. Both show black fruit aromatics with a fine tannic structure, typically elegant for Red Rock, and touch more textured and earthy for Gravelly Meadow. Volcanic Hill is more reserved, with less obvious, but potentially more complex aromatics, and the typically taut tannic structure more evidence against the fruits. It seems likely to be longest lived. All the wines have been running at alcohol levels around 14.5% for the past decade, up from an average of 14.1% in the previous decade. Occasionally Al produced a blend across the vineyards by selecting special barrels–the last vintage was 2013, with 70% Volcanic Hill, 25% Red Rock Terrace, and 5% Gravelly Meadow–and as of the 2019 vintage, the Three Vineyard Blend will become a regular feature (priced at the same level as the single-vineyard wines).
“Al thought Volcanic Hill would be the longest lived wine, but actually they all age equally well. But Volcanic always comes around last, there is no doubt about that,” said his stepson, Phil Ross, on a previousd visit. Tasting older vintages, I could not say I have a favorite: in some vintages I prefer Volcanic Hill, and in others Gravelly Meadow.
An updated profile will be included in the 2022 edition of the Guide to Napa.
Tasting Notes on 2018 Vintage
Red Rock Terrace
Deep black fruits on nose point towards blackcurrents. Sweet ripe fruits on palate show faint hints of alcohol coming through the richness. Tannins are fine but the wine is still a little tight, although showing some forward black fruit aromatics. The style seems more modern than it has in previous years; at least this is the easiest and most overtly aromatic of the trio. 14.5% 92 Drink 2023-2040
Even a little darker and more purple in hue than Red Rock. Nose a fraction more intense with more obvious blackcurrant aromatics. There’s a greater sense of structure, although the tannins are very fine, showing just a touch of asperity against the ripeness of the fruits. It’s a little riper and richer than Red Rock, with the black fruit aromatics just beginning to come out. 14.5% 93 Drink 2023-2040
Dark inky appearance, a little more intense than the others. This shows the smoothest palate of the trio and is the most reserved, with black fruit aromatics waiting to come out, and less evident than the others at first, although after a while they emerge to show greater complexity. The sense of reserve will turn into elegance as the wine develops and this certainly has the greatest potential in this vintage. 94 Drink 2024-2045