Social Vulnerability Index Recalculation
The Social Vulnerability Index Recalculation is based on the important work of the federal Centers for Disease Control. With the future of that index in doubt, the same federal datasets and methodologies were used to carry the index forward.
The most recent SVI uses the 2022 American Communities Survey as its base. This recalculation matches the 2022 baseline 100 percent. The 2022 methodologies form the basis of the updated calculations for subsequent ACS vintages. This platform will run updates on all new ACS releases.
Should the SVI be updated with changed methodologies, this platform will update to match, while preserving the 2022 methodologies for comparison purposes.
Lewis and Clark Coun — Social Vulnerability Index
Unofficial CDC-method recomputation, 2020–2024 ACS 5-year
Lewis and Clark Coun — Social Vulnerability Index by census tract
Where this is
Shading: Overall SVI Percentile
Lower (1 to 8)Lower-middle (13 to 15)Middle (17 to 64)Upper-middle (66 to 70)Higher (72 to 89)
Each unit is shaded by its Overall SVI Percentile value and grouped into equal-count bands (quantiles) against the other units shown — lighter = lower, darker = higher. It ranks position among the units in view; it does not grade places, and the ranges shift with which units are shown.
The map is bounded to this parent geography — it shows the selected unit among its own siblings only, the same depth rule the drill-down uses. Shading ranks position on the measure among the units shown; it does not grade places.
Click a tract to see its overall percentile and theme scores.
Median tract: 47th percentile (among tracts in MT).
These tracts span the 1st percentile to the 89th percentile. The width of that range is the internal disparity.
Widest spread across these tracts: Housing Type & Transportation — this theme most separates the higher- and lower-ranked tracts here.
The SVI ranks each tract's position relative to a comparison set; it is not averaged into one number for the area, because percentiles do not average meaningfully. The distribution — median, range, and shape below — is the summary.
Tract 11.01 (pop. 3,130) — 89th percentile — Well above the median
Driven by Household Characteristics (well above) and Housing Type & Transportation (well above); near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status.
Tract 12.02 (pop. 5,779) — 79th percentile — Above the median
Driven by Socioeconomic Status (well above) and Household Characteristics (well above); near the median on Housing Type & Transportation; below the median on Racial & Ethnic Minority Status.
Tract 4.00 (pop. 6,968) — 74th percentile — Above the median
Driven by Socioeconomic Status (above) and Household Characteristics (well above); near the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 5.04 (pop. 3,187) — 72nd percentile — Above the median
Driven by Socioeconomic Status (above) and Household Characteristics (well above); near the median on Housing Type & Transportation; below the median on Racial & Ethnic Minority Status.
Tract 9.00 (pop. 4,026) — 70th percentile — Above the median
Driven by Socioeconomic Status (above) and Housing Type & Transportation (above); near the median on Racial & Ethnic Minority Status; below the median on Household Characteristics.
Tract 11.02 (pop. 4,544) — 68th percentile — Above the median
Driven by Household Characteristics (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); below the median on Socioeconomic Status.
Tract 5.03 (pop. 4,802) — 66th percentile — Above the median
Driven by Household Characteristics (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (above); below the median on Socioeconomic Status.
Tract 8.00 (pop. 4,027) — 64th percentile — Above the median
Driven by Socioeconomic Status (above), Racial & Ethnic Minority Status (above) and Housing Type & Transportation (well above); below the median on Household Characteristics.
Tract 1.00 (pop. 1,615) — 47th percentile — Near the median
Driven by Socioeconomic Status (above) and Household Characteristics (above); below the median on Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 6.00 (pop. 2,622) — 34th percentile — Below the median
Near the median on Household Characteristics; below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 7.02 (pop. 5,036) — 17th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 5.01 (pop. 4,581) — 15th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 2.00 (pop. 6,472) — 14th percentile — Well below the median
Near the median on Household Characteristics; below the median on Socioeconomic Status, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 7.01 (pop. 2,580) — 13th percentile — Well below the median
Driven by Racial & Ethnic Minority Status (above); below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 12.01 (pop. 7,255) — 8th percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
Tract 10.00 (pop. 3,941) — 4th percentile — Well below the median
Near the median on Racial & Ethnic Minority Status; below the median on Socioeconomic Status, Household Characteristics and Housing Type & Transportation.
Tract 3.00 (pop. 2,899) — 1st percentile — Well below the median
Below the median on Socioeconomic Status, Household Characteristics, Racial & Ethnic Minority Status and Housing Type & Transportation.
SVI = the CDC/ATSDR Social Vulnerability Index, recomputed by this platform from American Community Survey 2020–2024 5-year estimates using CDC's published method. Percentiles rank each tract against tracts in MT. "Vulnerability" is the name of CDC's index; the platform reports where a place ranks on it, and does not grade places or their residents.
Top-decile flags follow CDC's own convention (≥ 90th percentile) and are attributed as such; they are not part of an official CDC distribution.