Tonto Natural Bridge Construction Blog
by Margy Parisella, Arizona State Parks Architect
This Blog will update the public on the status of the historic Tonto Lodge reconstruction project at Tonto Natural Bridge State Park. The Lodge is on the National Register of Historic Places. It was constructed in 1925–26 and is significant for its role in the development of tourism in Arizona.
Eccentric structural loading patterns from the roof to the basement are the reason for the structural improvement portion of the project. The structural improvements are also required before the reroofing portion of the project can begin. The Lodge houses the Visitor Center and Gift Shop and is currently closed to all public entry.
November 15, 2009
The ADA restroom at the Lodge now has new tile floors and walls. The dining and living rooms have been been painted. Some of the wood floors have been uncovered and the furniture is getting back in place.

October 21, 2009
Installation and finishing of drywall continues at the Lodge. Repair and replacement of the rain damaged ceilings will begin soon. Restroom upgrades to meet ADA Guidelines have begun.
September 4, 2009
Steel beams and columns have been added on either side of the existing wood beams and columns to carry the structural load of the building. Jim Garrison, State Historic Preservation Officer, visited the Lodge. Jim appreciated the "additive" nature of the structural improvements, which allowed the original historic fabric to remain in place.

The diamond shaped metal shingle roofing is almost complete. This product was selected because it most closely emulated the previous roofing, which is no longer available. The roof shingle size and shape were determined to be "character defining elements" of the lodge building. Perimeter insulation is also being added to the lodge building.

July 16, 2009
The Lodge is getting new fascia boards and soffits with vent strips. Insulation baffles will be placed between the roof joists to allow ventilation from the eaves to the dormer vents. Unfaced R-30 fiberglas blanket insulation will be added to the attic spaces. New guardrails / handrails are being installed at the porches to meet ADA guidelines. The archaic knob and tube electrical wiring shown in the attic will also be replaced with this project.
June 11, 2009
New beams and support posts have been added under the dining room and lobby floors. Attic glu-lam beams are also being bolted in place. An interesting second story tie-rod with wood truss and beam combination was uncovered that spans from the attic to support the beam over the living room. The original Celotex label (shown here), which was inside the wall shows that this material was produced in New Orleans.
The Architect for the Project is MRT Design, LLC with Gervasio and Associates, Inc. as the Structural Engineer.
May 21, 2009
Construction fencing has been installed around the Historic Tonto Lodge and selective demolition and repairs have begun within the building at the basement level.
May 13, 2009
The "Notice to Proceed with Construction" was issued for Monday, May 18th for "Structural Repairs and Roof Replacement" at the Historic Tonto Lodge. The General Contractor is BMJS Contracting, Inc. of Happy Jack, AZ.
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Western Region
- Alamo Lake
- Buckskin Mountain
- Cattail Cove
- Lake Havasu
- River Island
- Yuma Quartermaster Depot
- Yuma Territorial Prison
Northern Region
- Dead Horse Ranch
- Fort Verde
- Homolovi Ruins
- Jerome
- Red Rock
- Riordan Mansion
- Slide Rock
- Verde River Greenway
Eastern Region
- Boyce Thompson Arboretum
- Catalina
- Fool Hollow Lake
- Lost Dutchman
- Lyman Lake
- McFarland
- Oracle
- Tonto Natural Bridge
Southern Region





