AUGUST 15, 2012 excerpt from an e-mail from the Sandia Mountain Natural History Center manager:

It has come to my attention that the new addition of your book has come out saying that this is a useful trail head
and with a
map to our facility. That is just simply wrong. The SMNHC is only open to the public the First Sunday
from March through October. 8 days out of the year your book is correct and the other 357 days of the year it will
now be my job and my staff’s job to tell people that they are not allowed to hike here.
So here is what I am going to do:
1)      I will give each person that I turn away your name, email and phone number and tell them about the
inaccuracy in your book.
2)      I will put a sign on the gate saying that this area is not public access to the forest.
3)      I will contact Albuquerque Public Schools who owns the property and inform them of the situation.
60 Hikes Within 60 Miles: Albuquerque (2nd edition)
17. Mud Spring–Cañoncito
In the upcoming debate on what constitutes permission to walk between City and Federal properties, this sign will mysteriously vanish.
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Sandia Ranger District
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AUGUST 22, 2012 excerpts from the SMNHC website:

The Sandia Mountain Natural History Center is not open for public hiking access...
Our facilities, trails, and parking lot are closed to public access at all times... Come
explore the center by hiking, finding one of our geocaches, or enjoy a picnic lunch
(no grilling).  Free admissions.
We are not here to serve the public.
AUGUST 13, 2014:

Screen shot from the
New Mexico Museum of Natural History and Science
website, regarding the Sandia Mountain Natural History Center
(Highlights added)
SEPTEMBER 19, 2012 e-mail from the Sandia Mountain Natural History Center manager:

This is wrong. Fix it.

Public Days:
The first Sunday of every month from 9:00-4:00 the SMNHC will be open to the public.  
Come explore the center by hiking, finding one of our geocaches, or enjoy a picnic lunch.  
Free admissions.  

Summer Programs:
The Sandia Mountain Natural History Center offers specialized programs during the summer months for scout groups,
summer camps, and other outdoor enthusiasts. The SMNHC can design a program for your group's specific needs.

Your group can also use the facilities at the SMNHC and do a self-guided hike on the property.
AUGUST 10, 2014 e-mail from the Sandia Mountain Natural History Center DCA:

Normally we are not open to the public.  We do have some public events where access to the
trails is available.  If you would like I can add you to our email list and you will get notifications
when we have events scheduled.
excerpt from 60 Hikes within 60 Miles: Albuquerque, 2nd edition:

As of this writing, the SMNHC and its trails are closed to the public, except for special events
and public days. Further, the SMNHC does not encourage the use of its 0.3-mile segment of
Mud Spring Loop to access trails in the adjacent Sandia Mountain Wilderness...