Evidence
10 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-10).
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[1]research packet 622-packet.md (1 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: Queue: USS Plumas County / LST-1083 → VERIFIED — real identity: USS Plumas County (LST-1083), ex-USS LST-1083, named 1 July 1955 after Plumas County, California. Type: LST-542-class tank landing ship.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-plumas-county-lst1083-pkt-622-packet-md
-
[2]DANFS, Plumas County (LST-1083) - construction, Pacific service, Korean service, 1955 naming, 1961 Sasebo decommissioning, MSTS assignment (live NHHC page, verified 2026-10-02) [nhhc_danfs]
- Locator
- DANFS service narrative and spec block; published 2015-08-21
- Finding type
- vessel_history
- Finding
- Documented for this hull: 'laid down by the American Bridge Corp., Ambridge, Penn. 22 November 1944; launched 14 January 1945; and commissioned as LST-1083 at New Orleans, La. 13 February 1945, Lt. Ronald W. Homes in command.' After shakedown departed 22 March for the Panama Canal and Guam; transported troops and supplies to Saipan and Okinawa; on V-J Day at Guam loaded troops of the 4th Marines for Tokyo Bay and participated in the initial occupation of the Japanese homeland; transported passengers Guam to San Francisco arriving 12 January 1946; placed out of commission in reserve August 1946 at Astoria, Oregon. Recommissioned 8 September 1950; departed for Korea 19 December 1950 to shuttle troops/supplies Japan to Inchon; returned to Korea 22 March 1952 to resupply islands off the northwestern Korean coast and pick up prisoners of war; returned to US December 1952; third Korean tour September 1953 - July 1954, returning to San Diego. Alternated California amphibious operations with WestPac deployments; renamed Plumas County 1 July 1955; WestPac deployments 1956, 1958, 1959, 1960 incl. joint amphibious exercises with Nationalist China and Korea; out of commission in reserve at Sasebo, Japan 22 August 1961; assigned to MSTS December 1965 'where she remains into 1970.' Spec block: dp. 3,960; l. 328'-0"; b. 50'-0"; dr. 11'-2"; s. 12 k.; cpl. 119; a. 2 40mm.; cl. LST 511. One battle star WWII, three Korean War.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-02
- Study period
- 1944-1970 (entry coverage)
- Population
- American Bridge construction trades (1944-45); crew (1945-46, 1950-61); MSTS civil-service mariners (1965-out of service)
- Limitations
- Ship-specific official history; contains no asbestos or material content. Entry predates the 1972 striking and 1973 disposal (narrative ends with 'remains into 1970'). Commissioning detail conflicts with NavSource (13 Feb New Orleans/Lt. Homes here vs 12 Feb Algiers/LT Jeffries there - see ev-03 and gaps). DANFS 'cl. LST 511' is the period class label; modern convention and NavSource carry LST-542 class for this design group.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-01
-
[3]Bureau of Ships, Ships' Data, U.S. Naval Vessels, Vol. II (NAVSHIPS 250-011, Jan 1945) - official roster row for LST-1083 + LST design-group characteristics table (shipscribe.com scan, text layer) [other_primary]
- Locator
- SDB 1945 v2 roster, LST block pp. (LST1081-1086 rows); design characteristics table 'LANDING SHIP, TANK (LST)' LST1081-1152 row; NAVSHIPS 250-011 Vol. II
- Finding type
- vessel_history
- Finding
- Official BuShips roster row for this hull: 'LST1083 - American Bridge Co., Ambridge, Pa.; keel laid 22 Nov 44; ship launched 14 Jan 45; date of first commission 13 Feb 45' - corroborating DANFS and resolving the commissioning-date variant (NavSource's 12 Feb is the outlier). The design table places this hull in group LST1081-1152: 328 ft oa, 50 ft beam, 2,366 t light / 4,080 t full, 11.6 kt, machinery 2 x 'G.M. Diesel, 12-567A' engines, 1,700 shp - a diesel plant with no boilers (contrast LST-1153, the turbine prototype with 2-drum boilers and Westinghouse turbine).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-02
- Study period
- 1944-1945
- Population
- American Bridge construction trades (1944-45); crew
- Limitations
- Official primary documentation for construction milestones and machinery type; contains no asbestos or materials content. The diesel-only plant is the documented fact that shapes (narrows) the asbestos pathway - it establishes no asbestos finding.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-02
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[4]NavSource Online: Amphibious Photo Archive, USNS Plumas County (T-LST-1083) ex USS Plumas County (LST-1083) / USS LST-1083 - milestone timeline, campaign tables, specifications, CO list, photo record, disposal [other_primary]
- Locator
- NavSource 10/16/161083.htm header block, campaign tables, specifications block, commanding-officer table, photo captions; last updated 5 April 2024
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull: commissioned USS LST-1083 12 February 1945 at Naval Repair Base, Algiers, LA, LT DeWilton B. Jeffries USNR in command (conflicts with DANFS 13 Feb/New Orleans/Lt. Homes - BuShips SDB corroborates 13 Feb; see gaps). WWII Asiatic-Pacific: LST Flotilla 32, LST Group 95, LST Division 190; Okinawa Gunto operation 8-30 June 1945. Navy Occupation Service Medal periods 2-11 Sep 1945 and 8 Oct-1 Nov 1945. Decommissioned 1 August 1946, Pacific Reserve Fleet. Recommissioned 8 September 1950. Korean campaigns: First UN Counter Offensive 3 Feb-17 Mar 1951; Communist China Spring Offensive 24-30 Apr & 6-18 May 1951; Korean Defense Summer-Fall 1952 (20-21 May, 18 Jun-7 Jul, 9-31 Aug, 14 Oct-1 Nov 1952). Named USS Plumas County (LST-1083) 1 July 1955. Decommissioned 22 August 1961 at Sasebo, Japan; laid up Pacific Reserve Fleet, Sasebo; placed in service by MSTS as USNS Plumas County (T-LST-1083) December 1965; placed out of service, date unknown; struck from the Naval Register 1 June 1972. 'Final Disposition, sold by the Defense Reutilization and Marketing Service for scrapping, 1 May 1973.' One battle star WWII, three Korean War. Specs: 1,625 t lt / 4,080 t fl / 2,366 t beaching; 328 ft oa; 50 ft beam; 11.6 kt trial; 13 officers + 104 enlisted; troops 16 officers + 147 enlisted; 2 LCVP; armament design 2 twin + 4 single 40mm, 12 x 20mm; fuel diesel 4,300 bbl; propulsion 2 x GM 12-567A 900hp diesels, Falk reduction gears, three 100kW 230V DC ship's-service generators, two propellers 1,700 shp, twin rudders. CO table: Jeffries 12 Feb 1945-16 Oct 1945; Holmes 16 Oct 1945-2 Dec 1945; Campbell; Ray; Coll (to decommissioning 1 Aug 1946); May (1952); Edgerton (to 7 Mar 1956); Casseday (to 22 Apr 1958); Rockwell (to 9 Oct 1959); Davidson (to 17 Jul 1961); Karmenzind. Photos: beached on ramp 1945 probably Japan (Occupation); floating drydock with LSM-2 and LCT-1057 alongside; San Francisco Bay maneuvers off Oakland 15 Mar 1953; underway off Long Beach CA 1958 (USNI collection).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-02
- Study period
- 1944-1973
- Population
- American Bridge trades (1944-45); WWII/Korea-era crew; MSTS civil-service mariners (1965-?); shipbreakers (1973)
- Limitations
- NavSource is a volunteer secondary compilation tracking NVR/DANFS - generally reliable for milestones but it is not a primary registry. Commissioning entry conflicts with DANFS/BuShips on date (12 vs 13 Feb), place (Algiers vs New Orleans), and commissioning CO (Jeffries vs Homes); the NavSource CO table shows 'Holmes, Roland W.' assuming command 16 Oct 1945 (spelling differs there from DANFS 'Ronald W. Homes'). Disposal detail (DRMS scrapping sale 1 May 1973) derives from NVR lineage. No asbestos content anywhere on the page.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-03
-
[5]American Bridge Company official corporate history page - Ambridge plant and WWII production record [other_primary]
- Locator
- americanbridge.net/about/history/, '1940s' section
- Finding type
- vessel_history
- Finding
- The builder's own published history documents the Ambridge, PA plant - 'the largest such facility in the world' (completed 1903, the company town that gave the yard its context) - and states: '100% of American Bridge's capacity was utilized for National Defense projects from 1941-1945. American Bridge manufactured 199 LST's as well as four Aviation Repair Vessels, major components for 11 Essex Class Aircraft Carriers... and 348 Knock-down Barges.' The Ambridge yard was one of the inland 'cornfield' yards of the emergency LST program on the Ohio River; hulls launched at Ambridge were downriver-delivered for commissioning (this hull commissioned at New Orleans per DANFS).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-02
- Study period
- 1941-1945
- Population
- American Bridge Ambridge construction trades (1941-45)
- Limitations
- Builder-level context, not a hull record - the page does not name LST-1083. It documents that the Ambridge plant mass-produced LSTs 1941-45 at 100% defense capacity; it contains no asbestos, materials, or industrial-hygiene content. Page returned HTTP 406 to plain curl (bot filtering); content retrieved via firecrawl scrape 2026-10-02.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-04
-
[6]Consolidated era inference - BuShips SDB 1945 v2 machinery documentation (2 x GM 12-567A, no boilers, LST1081-1152 group) + NavSource specifications + era amphibious-ship construction practice; LST-1-class class profile (lst-1-class.class.json, class-f worktree) [other_primary]
- Locator
- SDB 1945 v2 design table (LST1081-1152 row); NavSource specifications block; class-profile asbestos row ev-lst-1-class-03
- Finding type
- asbestos_application
- Finding
- A diesel-powered LST built Nov 1944 - Feb 1945 sits squarely inside the wartime shipbuilding asbestos era. Era-standard applications aboard a diesel LST of this design group: GM diesel exhaust lagging and gaskets, engine-room thermal/acoustic insulation, deck coverings/tile, bulkhead and accommodation insulation, and winch/crane brake linings. The diesel-only plant (no boilers, no steam turbines) narrows the pathway relative to steam ships - no boiler or steam-line lagging - but does not remove it; machinery-space, accommodation, and deck-covering applications remain era-consistent.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-02
- Study period
- 1944-1973
- Population
- American Bridge construction trades (1944-45); crew across all eras incl. engine room; any yard/base trades during availabilities; 1973 shipbreakers
- Limitations
- Class/era inference only - no hull-specific insulation survey, material schedule, or work package located for LST-1083. Names era-standard applications, not confirmed installed materials; no quantity; no manufacturer attribution for this hull. Does not establish that asbestos was or remains aboard.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-05
-
[7]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked, HTTP 403)
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's construction (1944-45) and commissioned service (1945-46, 1950-61), her MSTS period (1965-forward), and her striking and disposal (1972-73). GAO also documented the Navy's 1975 policy of removing asbestos insulation only when damaged or required for repairs, meaning era insulation typically remained in place unless a yard period disturbed it.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-02
- Study period
- 1979
- Population
- Navy shipyard workers; ship crews; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved - gao.gov blocks automated fetch (HTTP 403, confirmed 2026-10-02); content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-06
-
[8]Wikimedia Commons file: '1st lst japan certificate.jpg' - scanned US Navy document; uploader identified as Rick Lieb, son of Berwyn T. Lieb, recipient of document [other_primary]
- Locator
- Commons file page, Summary table (Description/Source/Author)
- Finding type
- historical_record
- Finding
- A photographed shipboard certificate declares LST-1083 'the first LST to drop anchor in Japanese waters at the close of WWII' (Commons description: 'Certificate showing LST 1083 was the first LST to drop anchor in Japanese waters at the close of WWII... scanned from US Navy document'). Consistent with DANFS-documented fact that she loaded 4th Marines at Guam for Tokyo Bay and participated in the initial occupation, and with NavSource's Navy Occupation Service Medal periods (2-11 Sep 1945; 8 Oct-1 Nov 1945). The 'first LST' superlative itself rests on this ship-issued certificate's wording.
- Verification
- unverified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-02
- Study period
- 1945
- Limitations
- User-contributed scan of a Navy document on a tertiary hosting platform - provenance asserted by uploader (crewman's son), not independently verified against official records; the superlative is a commemorative claim, not an official finding. Related Wikipedia-only claims - combat action at Midway, Wake Island, the Marshall Islands, and Leyte, and presence at the surrender signing aboard Missouri - are NOT supported by DANFS or NavSource and are excluded from this record (see report exclusions).
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-07
-
[9]NARA, 'Vessel and Station Log Books at the National Archives' index page (deck-log custody guidance); note that US Navy and Coast Guard deck logs 1956-1978 were closed to researchers during the VA scanning project (notice dated 2019-08-22) [other_primary]
- Locator
- archives.gov/research/military/logbooks index + scanning-project notice; catalog.archives.gov search (JS-rendered, unfetchable)
- Finding type
- historical_record
- Finding
- Archival lead (not retrieved): this hull's deck logs should exist in NARA RG 24 (Records of the Bureau of Naval Personnel / Bureau of Navigation deck logs) for 1945-46 and 1950-61, and MSTS-period logs for T-LST-1083 (1965-forward) in the MSTS/MSC log series; NARA's own index notes deck logs 1956-1978 were closed during the VA digitization project. Deck logs document equipment repair, yard availabilities, and material disturbances that can evidence insulation work. NARA catalog (catalog.archives.gov) is JS-rendered and could not be queried for hull-specific items this session; American Bridge Ambridge contract/outfitting records would sit in RG 19 (Bureau of Ships) or Navy contract series rather than online.
- Verification
- unverified
- Role
- archival_lead
- Documentation level
- context_only
- Accessed
- 2026-10-02
- Study period
- 1945-1973 records
- Limitations
- Record-group mapping only - no box-level retrieval performed; existence of asbestos-specific documents for this hull is unknown until surveyed. The 1956-78 closure covers this hull's late commissioned era. Nothing in this row is an asbestos finding.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-08
-
[10]Batch-6571 search ledger (this record): live NHHC DANFS page; BuShips SDB 1945 v2 official roster + design table; NavSource 10/16/161083; MARAD ShipHistory API; NVR; American Bridge corporate history; CourtListener opinion + docket searches; secondary web sweep [other_primary]
- Locator
- search_ledger rows sl-uss-plumas-county-lst1083-01 through -12 (incl. -07b/-07c/-07d)
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or docketed case naming LST-1083 / USS Plumas County / T-LST-1083 was found in the public sources searched (see search_ledger). CourtListener returned zero hits on 'LST-1083' (opinions and RECAP dockets), 'USS Plumas County' (opinions), and 'Plumas County' + asbestos (opinions); the bare 'Plumas County' opinion query returned 371 hits, all name collisions with the California county's own litigation - no vessel-related hit among results returned (inspected set). MARAD ShipHistory holds no record (DRMS-side disposal). NVR has no entry (pre-1987 disposal).
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-02
- Study period
- 2026-10-02
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - a 1945-built hull is era-consistent with asbestos-containing materials, and the hull was scrapped in 1973 without a located hazmat or scrapping-condition record. Deck logs and shipyard work packages are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-plumas-county-lst1083-09
