The Old Faithful Inn replaced the Upper Geyser Basin Hotel, also known as the "Shack Hotel", which had burned down.
The Northern Pacific Railroad, in the form of the Yellowstone Park Association operating company, was required by the terms of its concession to build a new hotel no closer than 1/8 mile of Old Faithful, a stipulation the Yellowstone Park Association observed to the letter.
An initial design was prepared by architect A.W. Spalding in 1898, producing a design typical of the time, a turreted Queen Anne style hotel.
The design was approved by the Park Service,  but construction never started.
 Child instead hired Reamer to design a much more radical building with antecedents in the rustic camps of the Adirondacks.
Design work took place in 1902, and construction started in 1903, with work continuing through the winter to open in 1904.
 The original cost of the Inn was about $140,000, using materials gathered from within the park.
The hotel was furnished for another $25,000.
Most of the logs came from a location about 8 miles (13 km) south of Old Faithful, where a temporary sawmill produced boards as needed.
Stone came from the Black Sand Basin and from a site along the road to Craig Pass about five miles (8 km) to the east.
The unusually-shaped log brackets were collected from the surrounding forests.

The Inn has been expanded and modified several times.
In 1913 the East Wing was added to the 120-room original structure, and in 1922 the dining room was enlarged.
In 1927-1928 the West Wing was built, and the front of the main building extended.
All of these modifications were carried out under the supervision of the original architect, Robert Reamer.
A 1927 addition to the dining room has since become home to the Bear Pit Lounge.
 Installed in 1936 just off the lobby, the first Bear Pit featured carved and inlaid wood panels with humorous scenes involving bears, created at Reamer's suggestion.
When the lounge was converted to a coffee shop, the lounge was relocated to the dining room extension and the panels were replicated in etched glass in 1988.
Some of the original panels remain in the snack bar.
In 1940 the interior logs were peeled, revealing patterns created by bark beetles, and in 1966 the logs were cleaned and varnished.
An automatic fire sprinkler system was added in 1948, together with fire doors in the wings.

Some of the original furnishings remain, while care has been taken with newer pieces to remain compatible with the rustic design.
 Some furniture at the Old Faithful Inn was salvaged from the Canyon Hotel before it was demolished.
particularly the Limbert chairs in the dining room extension and some of the reading desks on the balcony.

The facility was closed for the duration of the Second World War (along with all other hotels in the park) and the park was unprepared for the huge number of visitors in 1946.

On August 17, 1959 the Old Faithful Inn was shaken by the 1959 Hebgen Lake earthquake which collapsed the dining room fireplace chimney and damaged the huge lobby fireplace, reducing the number of usable hearths from eight to two.
 The building was partially shaken loose from its foundations, and access to some of the upper levels had to be restricted due to safety concerns.
 There were no deaths or serious injuries at the Inn as a result of the earthquake.
 The dining room fireplace was finally rebuilt in 1985, but the outside portion of the lobby fireplace chimney was replaced with a single steel pipe, visible in many exterior photos.

In 1988, the inn was seriously threatened by the North Fork Fire, but was saved by the actions of firefighters, volunteers, and a sprinkler system which was installed on the roof the previous year.

The high-range rooms in the East and West wing additions were renovated in 1993 and 1994.
 In celebration of the Inn's centennial in 2004, a major multimillion-dollar renovation project of the original "Old House" started construction with the help of A&E Architects of Missoula, Montana.
 The project was broken into 3 construction phases with the final phase sched
The Old Faithful Inn replaced the Upper Geyser Basin Hotel, also known as the "Shack Hotel", which had burned down. The Northern Pacific Railroad, in the form of the Yellowstone Park Association operating company, was required by the terms of its concession to build a new hotel no closer than 1/8 mile of Old Faithful, a stipulation the Yellowstone Park Association observed to the letter. An initial design was prepared by architect A.W. Spalding in 1898, producing a design typical of the time, a turreted Queen Anne style hotel. The design was approved by the Park Service,  but construction never started.  Child instead hired Reamer to design a much more radical building with antecedents in the rustic camps of the Adirondacks. Design work took place in 1902, and construction started in 1903, with work continuing through the winter to open in 1904.  The original cost of the Inn was about $140,000, using materials gathered from within the park. The hotel was furnished for another $25,000. Most of the logs came from a location about 8 miles (13 km) south of Old Faithful, where a temporary sawmill produced boards as needed. Stone came from the Black Sand Basin and from a site along the road to Craig Pass about five miles (8 km) to the east. The unusually-shaped log brackets were collected from the surrounding forests.
The Inn has been expanded and modified several times. In 1913 the East Wing was added to the 120-room original structure, and in 1922 the dining room was enlarged. In 1927-1928 the West Wing was built, and the front of the main building extended. All of these modifications were carried out under the supervision of the original architect, Robert Reamer. A 1927 addition to the dining room has since become home to the Bear Pit Lounge.  Installed in 1936 just off the lobby, the first Bear Pit featured carved and inlaid wood panels with humorous scenes involving bears, created at Reamer's suggestion. When the lounge was converted to a coffee shop, the lounge was relocated to the dining room extension and the panels were replicated in etched glass in 1988. Some of the original panels remain in the snack bar. In 1940 the interior logs were peeled, revealing patterns created by bark beetles, and in 1966 the logs were cleaned and varnished. An automatic fire sprinkler system was added in 1948, together with fire doors in the wings.
Some of the original furnishings remain, while care has been taken with newer pieces to remain compatible with the rustic design.  Some furniture at the Old Faithful Inn was salvaged from the Canyon Hotel before it was demolished. particularly the Limbert chairs in the dining room extension and some of the reading desks on the balcony.
The facility was closed for the duration of the Second World War (along with all other hotels in the park) and the park was unprepared for the huge number of visitors in 1946.
On August 17, 1959 the Old Faithful Inn was shaken by the 1959 Hebgen Lake earthquake which collapsed the dining room fireplace chimney and damaged the huge lobby fireplace, reducing the number of usable hearths from eight to two.  The building was partially shaken loose from its foundations, and access to some of the upper levels had to be restricted due to safety concerns.  There were no deaths or serious injuries at the Inn as a result of the earthquake.  The dining room fireplace was finally rebuilt in 1985, but the outside portion of the lobby fireplace chimney was replaced with a single steel pipe, visible in many exterior photos.
In 1988, the inn was seriously threatened by the North Fork Fire, but was saved by the actions of firefighters, volunteers, and a sprinkler system which was installed on the roof the previous year.
The high-range rooms in the East and West wing additions were renovated in 1993 and 1994.  In celebration of the Inn's centennial in 2004, a major multimillion-dollar renovation project of the original "Old House" started construction with the help of A&E Architects of Missoula, Montana.  The project was broken into 3 construction phases with the final phase sched
Old Faithful Inn