It wasn’t on Mt Washington.
I am an amateur historian of sorts on the history of mountaineering and tourism in New England. There were no public works projects on the summit of Mt Washington, ever. Up until very recently, parcels of land on the summit were privately owned by companies, individuals, and Dartmouth College going back to the 1840’s. When the surrounding areas became part of the White Mountain National Forest, these landowners were given variances to continue their operations. I have in front of me several Depression-era guidebooks. The structures on the summit at that time included:
Summit House - a hotel rebuilt after a 1915 fire. privately-owned.
Tip-Top House - a stone hotel built in 1853, privately-owned
Stage Office - Operated by the Summit Road Company. It was in this building in 1934 that the highest wind gust ever recorded was measured (231 mph). There is a plaque on the building’s exterior memorializing the event. A new structure was built in 1937 for the observers, but it was torn down about 20 years ago, and there is no plaque. It was constructed with private funds.
Camden Cottage - a primitive refuge built for trampers in 1922
The Cog Railway was completed in 1869. private.
The Carriage Road was completed in 1861. private.
There are some plaques on the summit. Most memorialize victims of the summit’s infamous weather. The two prominent plaques include the wind record and recognition of the 10th Mountain Divison. Inside the Sherman Adams building (which is accessible to the public), there are several plaques on the wall commemorating individuals who contributed to various trail systems, scientific research, or club activities. These mostly go unnoticed by tourists in their rush to buy a souvenir postcard. Now that I think of it, I don’t have any good pictures of these.
sources include: Appalachian Mountain Club: White Mountain Guide, 1931, 1940, and 1960.
The Civilian Conservation Corp (CCC) was resposinble for a number of improvement to roads and roadside facilities. Camps sprung up all over the region. I must now quote from the bible of northeastern mountaineering and outdoor adventure, Forest and Crag by Laura and Guy Waterman:
However, the construction of new roads and facilities and repairs to the much older existing networks enabled greater access for the increasingly mobile American public. In very simplistic terms, their work helped contribute to the growth of the weekend tourist and the rise of winter sports, including American alpine skiing.
Back to the OP!
1. Despite the large numbers of tourists who visit the Northeastern forests each year, tourism today is not what it was 100-130 years ago. Rather than spend a weekend or a week, the Victorians would spend whole summers in the resorts of the north. They would often bring the entire extended family and a host of attendants. At the same time, the lumber industry was gradually discovering the large virigin tracts of timber west of Maine. Populations of permanent citizens were much greater at that time to support the service industries, hotels, railroads, and timber barons. Migrant labor from Quebec supplemented any shortages of manpower. Manpower was cheap and plentiful. Any project an entrepreneur envisioned could be completed in short order.
2. The building complexes seen on Mt Washington today took many years to complete. Mt Washington is a jumble of structures that have been built, burnt, demolished, and rebuilt anew. What you see today took 150 years to build.
3. Since the tourism heyday, many of the towns that supported such work have disappeared from the map. Hikers today may travel through the ruins of towns which once supported hundreds of lumberjacks and laborers. I regularly visit the town of Livermore who’s last living resident died in the early 1950’s. All that remains are a few ruined buildings and abandoned rail lines which have been swallowed by the forests. If you travel deeper into the wood, you will ocassionally stumble across old logging camps and their assorted debris.
In short, these mountains are more remote today than they were 100 years ago. In part, due to shifts in leisure time in our society - and the resulting economic consequences, but partly by design. We’re actively trying to make these places less accessible through conservation efforts. I hope that answers your question satisfactorily.