Diamond Bar intersections ranked by reported crashes
15 confirmed surface-street junctions in Diamond Bar, Los Angeles County, carrying 337 reported crashes between them in 2023, 2024 and 2025. 20 junctions were attempted here and 15 could be confirmed by two independent sources; the rest were dropped rather than guessed at.
This is a count of reported crashes, not a measure of risk. It is not adjusted for traffic volume, and a difference of two or three crashes between neighbouring rows is within ordinary year-to-year variation rather than a real gap. It says nothing about fault or about any individual claim.
| # | Junction | County | Crashes | Injured | Killed | 2026 so far part year, not ranked |
|---|---|---|---|---|---|---|
| 1 | Diamond Bar Bl & Grand Av | Los Angeles | 51 | 17 | 0 | 7 |
| 2 | Golden Springs Dr & Grand Av | Los Angeles | 47 | 25 | 0 | 6 |
| 3 | Brea Canyon Rd & Golden Springs Dr | Los Angeles | 32 | 13 | 0 | 5 |
| 4 | Brea Canyon Rd & Pathfinder Rd | Los Angeles | 31 | 12 | 0 | 1 |
| 5 | Diamond Bar Bl & Golden Springs Dr | Los Angeles | 29 | 11 | 0 | 12 |
| 6 | Diamond Bar Bl & Sunset Crossing Rd | Los Angeles | 28 | 12 | 0 | 8 |
| 7 | Brea Canyon Rd & Diamond Bar Bl | Los Angeles | 19 | 5 | 0 | 2 |
| 8 | Diamond Bar Bl & Mountain Laurel Wy | Los Angeles | 17 | 11 | 0 | 1 |
| 9 | Adel Av & Golden Springs Dr | Los Angeles | 14 | 6 | 0 | 2 |
| 10 | Grand Av & Rolling Knoll Rd | Los Angeles | 13 | 7 | 0 | 1 |
| 11 | Brea Canyon Rd & Lycoming St | Los Angeles | 13 | 5 | 0 | 5 |
| 12 | Diamond Bar Bl & Palomino Dr | Los Angeles | 11 | 9 | 0 | 3 |
| 13 | Diamond Bar Bl & Kiowa Crest Dr | Los Angeles | 11 | 8 | 0 | 1 |
| 14 | Golden Springs Dr & Lemon Av | Los Angeles | 11 | 4 | 0 | 1 |
| 15 | Golden Springs Dr & Prospectors Rd | Los Angeles | 10 | 5 | 0 | 3 |
This ranking covers 2023–2025. The 2026 figures are separate. They run from January to August 2026 — every whole month the state has published so far — and they are not part of the ranking or of any total above. Police agencies file at different speeds, so putting a part-reported year in a ranking would order agencies by how fast they file rather than roads by how often they are hit.
Recent months are still filling in, so treat them as a floor rather than a count. August 2026 held about 48% of what that month averaged across 2023–2025 when this data was compiled, so its real total will be higher. September 2026 is left out entirely: the state's file stops on 2026-09-01, so that month holds 15 records — a part of a month rather than a month that is late being filed.
Reporting runs at different speeds from one police department to the next, so this matters more than the statewide figure: Diamond Bar has filed 956 crashes for January–August 2026, against about 972 predicted by the same 2023–2025 crash rate — roughly 98%. So "none reported yet" in the 2026 column means no report has arrived for that junction, which is not the same as no crash happening there.
Sources: California Crash Reporting System (CCRS), California Highway Patrol; locations from the US Census Geocoder, each confirmed by a second independent source to within 50 metres. Method and limitations: methodology.