| Another attempt to find route will be made | Daily Humboldt Times | MF 10 | 7/23/1878 | 3 | 2 | Road route | Ferndale Bear River Ridge road | Route, Ferndale, Bear River Ridge Road |
| Another well being dug at brewery by Mercer Fraser | Humboldt Times | MF 10 | 8/2/1924 | 1 | 6 | New well | Eureka | Mercer Fraser, Another Well |
| Antone Berktold and Jerry Colivas are blowing stumps and widening Spruce st. | The Humboldt Times | MF 10 | 10/1/1930 | 2 | 3 | Street construction | Arcata | Street, Harris |
| Appears to be series called "Old Timer! Do you remember When..." | Humboldt Times | MF 10 | 6/4/1931 | 4 | | Series | | Series, Old Timer ! Do You Remember When |
| Apple Growers what gap in road graded by time next crop mature | Humboldt Times | MF 10 | 9/9/1912 | 2 | 4 | Road | Bull Creek Upper Mattole | Apple Growers, Road Work On Gap |
| Application sent to railroad commission by state highway commission to build a bridge | Humboldt Times | MF 10 | 11/3/1923 | 1 | 1 | Legal Notice | Klamath River | Application, Railroad Commission, Bridge, Highway Commission |
| Applied for license by Calif State Water Project Authority | Humboldt Times | MF 10 | 4/10/1952 | 1 | 6 | Applied | | Calif State Water Project Authority, License, Hydro Electric |
| Appointed county Survey | Humboldt Times | MF 10 | 5/13/1909 | 1 | 1 | BOS proceedings | Eel river Greigs | Bos Proceeding, County Survey |
| Approval of 10 acres for the juvenile detention home | Humboldt Times | MF 10 | 7/7/1924 | 10 | 2 | Infrastructure | R.W. creek Upper Mahole Berry's | Construction, Bridge, School, Hospital For Juvenile Detention Center, How Truss Bridge |
| approve bond | Humboldt Times | MF 10 | 6/13/1926 | 1 | | Vote | Eureka | Bond, Vote, Buses Augment, Street Cars |
| Approve of $20,000,000 allotment for first phase of Calif Central Valley Project | Humboldt Times | MF 10 | 9/13/1935 | 1 | 5 | Funding | | Approved, Allotment, Calif. Central Valley, President Roosevelt |
| Approved dams at Coyote Valley and one on Dry Creek | Humboldt Times | MF 10 | 8/11/1949 | 18 | | Dams | Coyote Valley Russian River Dry Creek | Dams, Approved, Cost $42,560,000 |
| Approved for sewer system | Humboldt Times | MF 10 | 7/14/1910 | 2 | | Legal Notice | Fields Landing | Fields Landing, Sewer System |
| Approved partial payment for new bridge | Humboldt Times | MF 10 | 6/28/1931 | 11 | | BOS Proceeding | Mattole River (North Fork) | Elmer Gardner, Approved Partial Payment, Bridge |
| Approved payment for bridge | Humboldt Times | MF 10 | 8/13/1958 | 17 | | BOS Proceedings | Eel Fort Seward | Payment, New Bridge, Fort Seward |
| Arcata & Mad river railroad extend wharf 600' feet | Daily Times | MF 10 | 5/3/1883 | 3 | 1 | Wharf work | | Arcata & Mad River Railroad, Wharf |
| Arcata & Mad river railroad filed petition to extent wharf | Daily Times Telephone | MF 10 | 3/25/1886 | 3 | 2 | New wharf | Arcata Mad River | John Berka, Arcata & Mad River Railroad, Wharf |
| Arcata & Mad River railroad folks surveying extension | Daily Times | MF 10 | 3/10/1883 | 3 | 1 | Railroad work | Arcata Mad River | Arcata & Mad River Railroad, Surveying , Extension |
| Arcata 4 lane completion held up due to strikes | Humboldt Times | MF 10 | 10/6/1953 | 5 | | Strikes | Arcata | Infrastructure-Roads, Arcata, Freeway, Strikes |
| Arcata and Mad River Railroad to discontinue passenger service | Humboldt Times | MF 10 | 5/1/1931 | 1 | 5 | Railroad use | Arcata Korbel | Arcata & Mad River Railroad, Railroad Commission |
| Arcata Appoints New City Engineer | Humboldt Times | MF 10 | 7/1/1956 | 12 | N/A | Engineer | Arcata | Charles M. Roscoe, Hal C. Acheson, Stanford, University Of Oklahoma, Stanley Roscoe, Martha Roscoe |
| Arcata Auto Park septic tank | Blue Lake Advocate | MF 2191 | 7/26/1924 | 4 | 3 | Sewage infrastructure | Arcata | Sewage, Arcata Auto Park, Infrastructure |
| Arcata being pressured by State Board of Health to cease dumping raw sewage | Humboldt Times | MF 10 | 4/8/1948 | 2 | 4 | Dumping | Arcata | Arcata, State Board Of Health, Raw Sewage |
| Arcata C of C will send commission eastward on 299 | Humboldt Times | MF 10 | 5/5/1929 | 2 | | Survey | Arcata Trinity River Weaverville | Arcata C Of C, Weaverville, Commission |
| Arcata City Council approved proposed plan in road work and new bridge | Humboldt Times | MF 10 | 10/7/1960 | 1 | | Legal Notice | Arcata | Approved, Proposed Plan, City Council |
| Arcata City Ordinance #279 | Humboldt Times | MF 10 | 9/16/1931 | 2 | 6 | City Ordinance | Arcata | Arcata, City Ordinance #279, J.C. Bixler |
| Arcata city trustees ordered an extension of sewer line | Daily Humboldt Standard | MF 9 | 7/9/1908 | 4 | 4 | Sewer work | Arcata | Arcata, City Trustees, Extension Sewer, Mr. Fry |
| Arcata Community Forest to be dedicated on Thursday | The Humboldt Times | MF 10 | 5/15/1955 | 12 | 6 - 7 | Dedication | Arcata Community Forest | Arcata Community Forest, First Municipally Owned Forest, Commission |
| Arcata completing sewage plant additions | Humboldt Times | MF 10 | 7/24/1958 | 13 | 3 | Sewage Plant Additions | Arcata | Arcata, Sewage Plant |
| Arcata conducting work on "children's playground" | Humboldt Times | MF 10 | 4/7/1927 | 2 | | Land use | Arcata | Arcata, Children'S Playground, George Markham Estate |
| Arcata dedicated new ballpark | Humboldt Times | MF 10 | 9/10/1937 | 1 | 4 | Photo | Arcata | Dedicate, Ballpark, Photo |
| Arcata derived her name from tribe of Indians | Blue Lake Advocate | MF 2191 | 10/7/1965 | 5 | 2 | Name meaning | Arcata | Arcata, Name , Indians |
| Arcata Freeway | Humboldt Times | MF 10 | 9/2/1951 | 16 | | Infrastructure - Roads | | Freeway, Arcata, Roads |
| Arcata Freeway to Open on July 13th | Humboldt Times | MF 10 | 6/5/1954 | 24 | | Infrastructure- Roads | Arcata Gannon St./Slough Eureka Slough | Arcata Freeway, Gannon Slough, Gannon St., Big 4, Eureka Slough |
| Arcata Freeway uncovers some facts concerning Port of Humboldt's | Humboldt Times | MF 10 | 8/2/1951 | 2 | | Arcata Highway work | Port Humboldt | Port Humboldt, Early Railroad History, Arcata Freeway |
| Arcata Freighter Sunk | Humboldt Times | MF 10 | 8/23/1942 | 9 | 1,2,3 | War news | Seattle Arcata | Japan, Sub, Freighter |
| Arcata gigantic admission day celebration | Humboldt Times | MF 10 | 9/10/1936 | 1 | | Celebration | Arcata | Arcata, Ca Indians, Sacred Tribal Dances, Admission Day Celebration |
| Arcata houses just got natural gas. | The Humboldt Times | MF 10 | 11/13/1945 | 3 | 2 | Housing update | Arcata | Gas, Housing |
| Arcata incorporated | Times Standard | MF 10 | 2/7/1958 | | | "Notes from Martha's Clippings " | Arcata | Incorporated |
| Arcata marsh Dyke | Humboldt Times | MF 10 | 12/18/1916 | 2 | 5 | Dyke construction | Arcata marsh Eureka Redwood Highway | Suisun Dredging Company, Dyke, Levee, Arcata Marsh, |
| Arcata of The 1850's and 60's | Daily Humboldt Times | MF 10 | March-April 1970 | | | History | Arcata | Arcata 1850'S-1860'S |
| Arcata Population numbers | Humboldt Times | MF 10 | 5/28/1953 | 1 | 6 | Population | Arcata | Arcata Population |
| Arcata Professional Building | Humboldt Standard | MF 9 | 6/19/1917 | 1 | 2 | Buildings | Arcata Corner of 5th and F. | Arcata Building Construction, Professional Building, Theater |
| Arcata Race Track work | The Daily Humboldt Times | MF 10 | 3/13/1908 | 3 | 1 & 2 | Race track | Arcata Race Track | Arcata Race Track |
| Arcata redwood company acquired 25 acres next to 101 | Humboldt Times | MF 10 | 12/19/1948 | 26 | | Land use | | Arcata Redwood Company, Howard A. Libbey |
| Arcata road in bad condition | Daily Times | MF 10 | 2/2/1883 | 3 | 1 | Road condition | Arcata | Arcata, Road Condition |
| Arcata Union High School | Humboldt Times | MF 10 | 6/16/1918 | 6 | | Contract | Arcata | Arcata Union High School, William Hays, Franklin Georgeson, Sr. |
| Arcata Veterans building almost done, Old Kirby building torn down | Humboldt Times | MF 10 | 8/21/1930 | 2 | | New building | Arcata | Arcata Veterans Building, Old Kirby Building |
| Arcata-Eureka Road (OAR) surfacing | Humboldt Times | MF 10 | 7/27/1917 | 2 | 6 | Development | Hannah's Crossing at Mad River | Road, Asphalt, N.W.P.R.R., Rebuild, "Arcata And Vicinity" |
| Arcatans passed 2 bond issues | Humboldt Times | MF 10 | 4/15/1948 | 5 | 4 | Dond issues | Arcata | Arcata, Bond Issues |
