According to jjhitt (see comment below) these were for storage of munitions -- bombs and ammunition. I assume this was during WWII
Great shot, but these were not shelters. The doors lock from the outside and there are no toilet facilities. Rather, they were meant for storage of munitions (bombs and ammo). They were originally covered with several feet of earth and were widely separated. The idea being, if one blew up, the damage would be limited to that bunker only, not the entire depo. Also, the depo used horse drawn wagons to move materials; the reason being that gasoline engines presented too great an explosion hazard.
I'll take your word for it, and there are several of these that are, as you say -- widely separated.
It's not obvious to me why there was a need to store do much munitions in Houston, Texas.
Here's a little history on the Ordinance Depot:
SAN JACINTO ORDNANCE DEPOT. San Jacinto Ordnance Depot was a World War II facility located on a 4,954-acre reservation on the Houston Ship Channel fifteen miles south of Houston. Its functions were to receive, store, and inspect all classes of ammunition (other than smoke) destined for shipment through its docks or through the New Orleans port and to receive, inspect, recondition, and store ammunition received from posts, camps, stations, and overseas theaters of operations. Captains of the ports of Houston and Galveston objected to the location of an ammunition depot so close to manufacturing plants, shipyards, and an oil refinery, but the United States Coast Guard approved the project. The first commanding officer arrived at the installation on November 21, 1941; on June 1, 1942, the depot received its first shipment of four cars of propellant charges. The first commercial vessel was loaded at San Jacinto on September 7, 1944. The depot supplied both the army and the navy; by December 31, 1945, it had received over 329,000,000 pounds of ammunition and had shipped over 208,000,000 pounds. The San Jacinto Ordnance Depot continued to ship army and navy supplies between 1945 and 1950, but plans had been made for phasing out activities as soon as the decreasing need for war materials would allow. With the involvement of the United States in the Korean conflict, the need for the depot and its services again arose, and phasing out was postponed. In 1959 the depot was declared surplus, and the United States Army Corps of Engineers took custody. In October 1964 all facilities of the San Jacinto Ordnance Depot were sold to the Houston Channel Industrial Corporation for somewhat more than ten million dollars.
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Photo taken in Harris County, TX, USA
Misplaced? Suggest new location