Historic ship statistics reveal more than how many vessels existed at a particular time. They also show how fleet capacity changed, sometimes in a different direction from vessel count. The U.S. Maritime Administration’s U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present series records vessels, gross tonnage (GT), and deadweight tonnage (DWT) for the U.S.-flag privately owned merchant fleet in each year from 1946 through 1995.
This article focuses on that U.S. fleet and those annual measurements. The figures are historical entries from the named MARAD series; they are not presented as an independent verification of the underlying legacy record.
Contents
- What the series measures
- The postwar expansion, 1946–1951
- A large fleet settles into a plateau, 1952–1969
- Vessel numbers fall while capacity grows, 1970–1982
- The contraction of the 1980s
- The 1990s decline
- Selected milestone comparisons
What the series measures
The MARAD series reports three different dimensions of the fleet. Vessel count is the number of vessels. GT is the reported gross tonnage total, while DWT is the reported deadweight tonnage total. These measures should be read together because a smaller fleet can still represent substantial capacity if its remaining ships are larger.
The geography and ownership scope are specific: these are U.S.-flag, privately owned merchant vessels. They are not a worldwide merchant-fleet total, a count of every historically existing ship, or a measure of naval and non-merchant vessels. Each value below refers to the relevant year in the MARAD series.
The opening and closing observations provide a useful frame:
| Year | Vessels | GT | DWT |
|---|---|---|---|
| 1946 | 644 | 4,627 | 6,989 |
| 1979 | 569 | 12,967 | 20,540 |
| 1982 | 573 | 13,615 | 21,647 |
| 1995 | 316 | 10,563 | 14,982 |
Source for all table values: MARAD, U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present.
The postwar expansion, 1946–1951
The first six observations show a rapid expansion in all three reported measures. In 1946, the fleet had 644 vessels, 4,627 GT, and 6,989 DWT. One year later, the series listed 980 vessels, 7,605 GT, and 11,281 DWT. In 1948, the totals reached 1,169 vessels, 9,250 GT, and 13,850 DWT.
Growth in vessel count continued into 1949, when the fleet reached its highest count in this series: 1,188 vessels. That year also recorded 9,470 GT and 14,240 DWT. The 1950 entry was lower at 1,087 vessels, 8,797 GT, and 13,197 DWT, before the fleet expanded again in 1951 to 1,288 vessels, 10,318 GT, and 15,473 DWT.
| Year | Vessels | GT | DWT |
|---|---|---|---|
| 1946 | 644 | 4,627 | 6,989 |
| 1947 | 980 | 7,605 | 11,281 |
| 1948 | 1,169 | 9,250 | 13,850 |
| 1949 | 1,188 | 9,470 | 14,240 |
| 1950 | 1,087 | 8,797 | 13,197 |
| 1951 | 1,288 | 10,318 | 15,473 |
The 1951 vessel count is higher than the 1949 peak, while the 1951 GT and DWT totals are also higher. Within the series, this establishes an early period in which fleet scale increased in both ship numbers and reported capacity. Source: MARAD, U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present.
A large fleet settles into a plateau, 1952–1969
After 1951, vessel count gradually moved lower, but the capacity measures did not follow a simple downward path. The fleet had 1,264 vessels, 10,245 GT, and 15,313 DWT in 1952. The 1953 entry was 1,249 vessels, 10,282 GT, and 15,355 DWT. By 1955, the figures were 1,075 vessels, 9,177 GT, and 13,597 DWT.
The count fell below 1,000 in 1961, when the fleet had 973 vessels. Yet that year’s 9,616 GT and 14,097 DWT remained close to the preceding decade’s levels. In 1962, the fleet recorded 985 vessels, 9,982 GT, and 14,568 DWT. The 1964 figures were 963 vessels, 10,200 GT, and 14,729 DWT.
The middle 1960s show a further separation between count and capacity. In 1965, the series recorded 948 vessels, 10,149 GT, and 14,650 DWT. The totals rose to 965 vessels, 10,368 GT, and 14,961 DWT in 1966, and 974 vessels, 10,480 GT, and 15,121 DWT in 1967. In 1968, the fleet had 967 vessels, 10,649 GT, and 15,346 DWT. The 1969 entry was 931 vessels, 10,641 GT, and 15,453 DWT.
For this period, vessel count was generally lower than in the early 1950s, while GT and DWT reached or exceeded those earlier levels. The MARAD figures therefore describe a fleet whose reported capacity was sustained even as the number of vessels changed. Source: MARAD, U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present.
Vessel numbers fall while capacity grows, 1970–1982
The 1970s brought a pronounced decline in vessel count. The series lists 793 vessels in 1970, 711 in 1971, and 651 in 1972. Counts then fell to 596 in 1973, 583 in 1974, and 580 in 1975. The low point for this part of the series was 571 vessels in 1977, followed by 584 in 1978 and 569 in 1979.
The capacity totals moved differently. GT rose from 9,780 in 1970 to 11,163 in 1977, then to 12,158 in 1978 and 12,967 in 1979. DWT moved from 14,406 in 1970 to 17,321 in 1977, 18,982 in 1978, and 20,540 in 1979. In 1976, the fleet had 577 vessels, 10,531 GT, and 16,020 DWT; in 1975, it had 580 vessels, 10,103 GT, and 15,028 DWT.
The divergence continued into the early 1980s. In 1980, 578 vessels were associated with 13,467 GT and 21,103 DWT. The 1981 figures were 574 vessels, 13,516 GT, and 21,479 DWT. In 1982, the fleet had 573 vessels, 13,615 GT, and 21,647 DWT. Thus, the highest GT and DWT entries in the supplied 1946–1995 series occur in 1982, even though the vessel count was less than half the 1951 count.
Source: MARAD, U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present.
The contraction of the 1980s
After the 1982 capacity peak, both capacity measures became more variable and the vessel count continued downward. The fleet had 538 vessels, 13,386 GT, and 21,569 DWT in 1983. In 1984, the figures were 492 vessels, 13,075 GT, and 20,939 DWT. The 1985 entry recorded 477 vessels, 13,490 GT, and 21,195 DWT.
The count fell to 456 vessels in 1986, with 13,105 GT and 20,727 DWT. In 1987, 444 vessels represented 13,569 GT and 21,200 DWT. The 1988 totals were 424 vessels, 13,641 GT, and 21,601 DWT. This was the final year in the series with more than 21,000 DWT after the 1982 peak.
The decade ended with 407 vessels, 13,096 GT, and 20,439 DWT in 1989. Compared with 1982, the 1989 fleet had fewer vessels and lower reported capacity, although its GT and DWT totals remained close to the earlier peak. Source: MARAD, U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present.
The 1990s decline
The series records a brief count increase in 1990, when the fleet had 408 vessels, 13,306 GT, and 20,771 DWT. It then declined to 394 vessels, 12,729 GT, and 19,716 DWT in 1991. The 1992 figures were 384 vessels, 12,611 GT, and 18,774 DWT.
The downward movement continued through the end of the supplied period. In 1993, the fleet had 367 vessels, 11,990 GT, and 17,553 DWT. In 1994, it had 354 vessels, 11,462 GT, and 16,477 DWT. The 1995 entry recorded 316 vessels, 10,563 GT, and 14,982 DWT.
The 1995 observation is the lowest vessel count in the series. Its GT and DWT totals are also below the 1980s values, but they remain above the 1946 starting totals. This combination distinguishes the later period from the opening postwar expansion: vessel count was much lower, while the reported capacity totals were still higher than at the beginning of the record. Source: MARAD, U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present.
Selected milestone comparisons
The following observations summarize the main shifts without combining measurements into unsupported derived statistics:
- 1946: 644 vessels, 4,627 GT, and 6,989 DWT.
- 1951: 1,288 vessels, 10,318 GT, and 15,473 DWT.
- 1969: 931 vessels, 10,641 GT, and 15,453 DWT.
- 1979: 569 vessels, 12,967 GT, and 20,540 DWT.
- 1982: 573 vessels, 13,615 GT, and 21,647 DWT.
- 1988: 424 vessels, 13,641 GT, and 21,601 DWT.
- 1995: 316 vessels, 10,563 GT, and 14,982 DWT.
Read as a sequence, these milestones show three distinct patterns. The early postwar years brought expansion in vessel count and capacity. The middle decades saw vessel count decrease while GT and DWT remained high or rose. The final years combined a lower vessel count with a decline in both capacity measures from their early-1980s highs.
All figures in this article are annual historical measurements for the U.S.-flag privately owned merchant fleet from MARAD’s U.S.-Flag Privately-Owned Merchant Fleet, 1946-Present series. GT and DWT are retained as reported, and the years refer to the measurement year shown in that series.