The number of lightweight aggregate producing plants per state 
for both natural and manufactured aggregates is shown on the map of 
Figure 4-1. Approximately 60 percent of the plants are in coastal 
states; of these, about 50 plants are near coastal waters. All light- 
weight aggregate plants known to be in existence are listed on the 
Lightweight Aggregate Map issued by Pit and Quarry Publications (1969). 
Each plant's address, the type or types of lightweight aggregate it 
produces, and the brand name or names of the products are shown. 
Cement. The below tabulated information shows the amount of 
portland cement shipped from mills, and the manufacturing capacity for 
the U. S., the Pacific Coast States and Texas. The latter is the 
largest producer on the southern and eastern seaboards. 
Portland Cement, Thousands of 376-1b Barrels 
Shipment From Mills | Manufacturing Capacity 
Location 
1967 1968 | 1967 WONoXey I 76 ee 
1967 | 1968 | 
Washington 
374,017 | 397,448 508,952 | 509,058 
5,614 6,328 9,575 8,200 
3,518 3,812 6,400 5,700 
42,034 | 47,595 62,300 | 64,300 
31,944 | 34,499 46,199 | 47,793 
Oregon-Nevada 
California 
Texas 
Source: Tables 2 and 7 of U. S. Department of the Interior. Reprints 
from the 1968 Bureau of Mines Yearbook, Cement. Worldwide 
production of cement by countries is given in Table 22, p. 
24 of this reference. 
It may be observed that in the U. S. as a whole there is a reserve 
manufacturing capacity of about 23%, and in California, the reserve 
capacity amounted to about 27% in 1968. 
In a location such as California, where the production of cement 
in 1968 amounted to 12. percent of the entire U. S. production, it is 
unlikely that a new cement plant would be required. Even if a constru- 
tion site were to be selected in Oregon or Washington, a new cement 
plant may not be justified for MOBS. But this would have to be determined 
on the basis of a trade off with cost of shipping cement from other areas. 
The number of U. S. portland cement distributing plants is shown on the 
map of Figure 4.2. The original ''Portland Cement Map," lists each 
producing plant by city and state as well as the grinding and distribut- 
ing plants. (Pit and Quarry Publications, 1969) 
4-3 
