04 SUBDIVISION STANDARDS
Table 4-1: Block Sizes and Connectivity | |||
|---|---|---|---|
Planning Context | Block Length | Block Area | Cul-de-sac Limits |
Walkable/Compact Downtown, core areas of commercial centers, and abutting blocks adjacent to walkable places. | 250' min. 500' max. | 2.5 - 5 acres | Prohibited |
General Traditional neighborhoods, near downtown areas, and areas supporting commercial corridors. | 350' min. 800' max. | 4 to 8 acres | 250' max. |
Suburban Areas more removed from walkable centers, commercial corridors or large scale projects arranged around a campus plan. | 500' min. 1,000' max. | 5 to 8 acres | 500' max. |
![]() Figure 4-1 Street Network Design Exceptions for larger blocks and oversized parcels should mimic the connectivity, street networks, and streetscape designs required by this Code with internal street networks. |
Table 4-2: Street Design Types and Functional Classification | |||
|---|---|---|---|
Street Type | Arterial (A) | Collector (C) | Local (L) |
Standard A basic street type appropriate generally where no particular development characteristics or urban design context warrant application of other street types. | ▪ | □ | □ |
Activity A pedestrian-oriented street type appropriate for all areas where walkability is a goal. It is characterized by narrow lanes, slow speeds, on-street parking, and large, well-designed pedestrian amenity zones that support businesses and economic activity along these streets. | □ | ▪ | ▪ |
Neighborhood A community-oriented street type appropriate where a higher level of neighborhood design amenity and neighborhood walkability is desired. It is characterized by large street trees, sidewalks, slow speeds, and occasional on-street parking. | ▪ | ▪ | ▪ |
Green A natural-oriented street type appropriate where streets cross or align with natural features, particularly to emphasize the parks and environmental themes in the plan. It is characterized by slow to moderate speeds, informal and natural landscape edges, and the incorporation of the City trails system. | □ | ▪ | ▪ |
▪ | Preferred Type |
□ | Limited Type, based on development pattern, street network plan and surrounding context and natural characteristics |
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LOCAL - STANDARD (L-S) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 50' (min) |
B | Pavement Width (back of curb) | 28' - 36' |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 5' one side |
E | Planting Area/Amenity | 5' |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 12' |
F/H | Parking Area/Shoulder | 1' - 2' shoulder OR 8' parallel |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn; easement alt. | |
Tree Spacing | 40' - 60' on center | |
Bicycle Facility | None - within traffic flow | |
Target Speed | 25 - 35 mph | |
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LOCAL - GREEN (L-G) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 50' (min) |
B | Pavement Width | 18' - 20' |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 10' trail (optional, one side) |
E/F | Planting Area/Amenity | 15' (min) |
F | Drainage/Street Edge | 6' swale (min) |
Street | ||
G | Travel Lane | 9' - 10' |
H | Parking Area/Shoulder | 2' shoulder |
General | ||
Walkway Type | Multi-use trail | |
Planting Type | Natural area | |
Tree Spacing | Dense landscape | |
Bicycle Facility | None - within traffic flow | |
Target Speed | < 25 mph | |
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LOCAL - NEIGHBORHOOD (L-N) | ||
Width | ||
A | Right-of-Way Width | 50' (min) |
B | Pavement Width (back of curb) | 25' - 28' |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 5' (min) |
E | Planting Area/Amenity | 6' (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 9' two-way; OR 14' yield flow |
F/H | Parking Area/Shoulder | 6' limited parking |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn | |
Tree Spacing | 25' - 40' on center | |
Bicycle Facility | None - within traffic flow | |
Target Speed | < 20 mph | |
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LOCAL - ACTIVITY (L-A) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 50' (min) |
B | Pavement Width (back of curb) | 34' (parallel parking) 60' (angled parking) |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D/E | Sidewalk | 8' (min) |
E | Planting Area/Amenity | 4' - 6' tree wells |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' |
F/H | Parking Area/Shoulder | 7' parallel 19' angled (60°) |
General | ||
Walkway Type | Sidewalk/Attached | |
Planting Type | Tree wells | |
Tree Spacing | 25' on center | |
Bicycle Facility | None - within traffic flow | |
Target Speed | < 20 mph | |
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COLLECTOR - STANDARD (C-S) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 60' (min) two lane 80' (min) four lane |
B | Pavement Width (back of curb) | 28' - 32' two lane 50' - 56' four lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 5' (min) |
E | Planting Area/Amenity | 5' (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' two to four lane |
F/H | Parking Area/Shoulder | 1' - 2' shoulder |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree wells | |
Tree Spacing | 40' - 60' on center | |
I | Bicycle Facility | 14' outside shared lane; OR 6' dedicated lane |
Target Speed | 35 mph | |
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COLLECTOR - GREEN (C-G) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 60' (min) two lane 70' (min) three lane |
B | Pavement Width (back of curb) | 24' - 32' two lane 34' - 42' three lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 10' |
E/F | Planting Area/Amenity | 15' (min) |
F | Drainage/Street Edge | 8' swale (min) |
Street | ||
G | Travel Lane | 10' - 11' two to three lane |
H | Parking Area/Shoulder | 2' shoulder |
General | ||
Walkway Type | Multi-use path | |
Planting Type | Natural area | |
Tree Spacing | Irregular/Dense | |
G | Bicycle Facility | 14' outside shared lane OR 6' dedicated lane |
Target Speed | 30 - 35 mph | |
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COLLECTOR - NEIGHBORHOOD (C-N) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 60' (min) two lane 70' (min) three lane |
B | Pavement Width (back of curb) | 24' - 34' two lane 34' - 40' three lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 6' (min) |
E | Planting Area/Amenity | 8' (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' two to three lane |
F/H | Parking Area/Shoulder | 7' parallel - both sides; OR 6' parallel - one side three lane |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn | |
Tree Spacing | 25' - 40' on center | |
G | Bicycle Facility | 14' outside shared lane |
Target Speed | < 30 mph | |
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COLLECTOR - ACTIVITY (C-A) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 60' - 96' two lane 70' - 94' three lane 80' - 104' four lane |
B | Pavement Width (back of curb) | 36' - 62' two lane 46' - 70' three lane 56' - 80' four lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D/E | Sidewalk | 10' (min) |
E | Planting Area/Amenity | 4' - 6' tree well |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' two to four lane |
F/H | Parking Area/Shoulder | 8' parallel 20' angled (60°) |
General | ||
Walkway Type | Sidewalk/Attached | |
Planting Type | Tree well | |
Tree Spacing | 25' - 40' on center | |
Bicycle Facility | None - within traffic flow | |
Target Speed | < 20 mph | |
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COLLECTOR - PARKWAY/BOULEVARD (C-P/B) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 80' - 90' two lane 96' - 100' four lane |
B | Pavement Width (back of curb) | 24' - 36' two lane (14' - 16' each if center median) 50' - 54' four lane (26' - 28' each if center median) |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 6' (min) |
E | Planting Area/Amenity | 20' (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' two to four lane |
F/H | Parking Area/Shoulder | 1' - 2' shoulder |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn OR Tree lawn + median | |
Tree Spacing | 25' - 40' on center OR 40' - 60' if double row in tree lawn or tree lawn + median | |
G/H | Bicycle Facility | 14' outside shared lane OR 6' dedicated lane |
Target Speed | 35 mph | |
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ARTERIAL - STANDARD (A-S) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 120' |
B | Pavement Width (back of curb) | 46' - 60' four lane 60' - 70' five lane |
Streetscape | ||
C | Utility Placement- See GMC § 17.04.040(F) | |
D | Sidewalk | 5' (min) |
E | Planting Area/Amenity | 5' (min) + 12' center median |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 12' four to five lane |
F/H | Parking Area/Shoulder | 1' - 2' shoulder |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn; Easement alt. + median | |
Tree Spacing | 40' - 60' on center | |
I | Bicycle Facility | 6' dedicated lane OR off-street trail |
Target Speed | 35 - 45 mph | |
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ARTERIAL - GREEN (A-G) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 90' three lane 100' four lane |
B | Pavement Width (back of curb) | 28' - 36' two lane 44' - 52' four lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 10' |
E/F | Planting Area/Amenity | 20' (min) |
F | Drainage/Street Edge | 10' swale (min) |
Street | ||
G | Travel Lane | 10' - 12' two to four lane |
H | Parking Area/Shoulder | 2' shoulder |
General | ||
Walkway Type | Multi-use path | |
Planting Type | Natural area | |
Tree Spacing | Irregular/Dense | |
I | Bicycle Facility | Off-street trail OR 6' dedicated lane |
Target Speed | 35 - 45 mph | |
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ARTERIAL - NEIGHBORHOOD (A-N) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 70' (min) three lane 80' (min) four lane |
B | Pavement Width (back of curb) | 34' - 40' three lane 44' - 50' four lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 6' (min) |
E | Planting Area/Amenity | 8' (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' three to four lane |
F/H | Parking Area/Shoulder | 7' parallel; OR 1' - 2' shoulder |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn | |
Tree Spacing | 25' - 40' on center | |
G | Bicycle Facility | 14' shared lane |
Target Speed | < 30 - 35 mph | |
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ARTERIAL - ACTIVITY (A-A) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 80' - 90' three lane 90' - 100' four lane |
B | Pavement Width (back of curb) | 48' - 62' three lane 56' - 80' four lane |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D/E | Sidewalk | 12' (min) |
E | Planting Area/Amenity | 4' tree well (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' three to four lane |
H | Parking Area/Shoulder | 8' parallel 20' angled (60°) |
General | ||
Walkway Type | Sidewalk/Attached | |
Planting Type | Tree well | |
Tree Spacing | 25' on center | |
Bicycle Facility | None - within traffic flow | |
Target Speed | < 20 mph | |
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ARTERIAL - PARKWAY/BOULEVARD (A-P/B) | ||
|---|---|---|
Width | ||
A | Right-of-Way Width | 120' - 130' four lane 140' - 150' six lane |
B | Pavement Width (back of curb) | 50' - 54' four lane (26' - 28' each if center median) 74' - 78' six lane (38' - 40' each if center median) |
Streetscape | ||
C | Utility Placement - See GMC § 17.04.040(F) | |
D | Sidewalk | 8' (min) |
E | Planting Area/Amenity | 30' (min) |
F | Drainage/Street Edge | 1' - 2' curb/gutter |
Street | ||
G | Travel Lane | 10' - 11' four to six lane |
F/H | Parking Area/Shoulder | 1' - 2' shoulder |
General | ||
Walkway Type | Sidewalk/Detached | |
Planting Type | Tree lawn OR Tree lawn + median | |
Tree Spacing | 25' - 40' on center OR 40' - 60' if double row in tree lawn or tree lawn + median | |
G/I | Bicycle Facility | 14' shared lane OR 6' dedicated lane |
Target Speed | 35 mph | |
![]() Figure 4-2 Corner Curb Radii Intersections with smaller corner curb radii reduce crossing distances and slow traffic to improve safety for pedestrians. |
Table 4-3: Corner Curb Radius | |
|---|---|
Intersection Type | Curb Radius |
Local/Local | 5' to 15' |
Local/Collector | 10' to 20' |
Local/Arterial | 15' to 20' |
Collector/Collector | 10' to 20' |
Collector/Arterial | 20' to 30' |
Arterial/Arterial | 25' to 30' |
Table 4-4: Clear Sight Distance | |
|---|---|
Design Speed of Intersecting Street | Intersection Sight Distance (measured along centerline of intersecting street) |
15 mph | 105' |
20 mph | 125' |
25 mph | 150' |
30 mph | 200' |
35 mph | 225' - 250' |
40 mph | 275' - 325' |
45 mph | 325' - 400' |
Source: American Association of State Highway and Transportation Officials, A Policy on Geometric Design of Highways and Streets. |
![]() Figure 4-3 Sight Distances Sight distances for intersections and road access shall be measured from a control point and based on the speeds of oncoming traffic. |
![]() Figure 4-4 Limited Obstructions Limited obstructions may be permitted in contexts where they do not impede sight lines and are appropriate to the overall urban design characteristics of the public realm. |
Table 4-5: Open and Civic Space Types and Context | ||||||
|---|---|---|---|---|---|---|
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | |
Planning Context | Natural Area | Park | Trail/Greenway | Green | Square | Plaza/Courtyard |
Walkable/Compact Downtown, core areas of commercial centers, and abutting blocks adjacent to walkable places. | □ | □ | □ | ▪ | ▪ | ▪ |
General Traditional neighborhoods, near downtown areas, and areas supporting commercial corridors. | □ | ▪ | □ | ▪ | ▪ | ▪ |
Suburban Areas more removed from walkable centers, commercial corridors or large scale projects arranged around a campus plan. | □ | ▪ | ▪ | ▪ | □ | □ |
▪ | Preferred Type |
□ | Limited Type, based on opportunities corresponding with the bike and pedestrian plan trail locations or environmental features plan. |
Table 4-6: Required Open Space | |
|---|---|
A, RE | N/A |
R-1, R-2 | 10% |
R-3, R-4, R-5, RM-P | 15% |
C-O, CO-A, C-1 | 8% |
C-2, C-3 | 12% |
M-1, M-2, REC | N/A |
Natural Area | |
|---|---|
The size, location, and design of a Natural Area shall be dependent on the planning context, the presence of natural amenities and ecological functions worthy of protection, and the ability of the designated area to provide significant continuity with nearby natural features. However, in general these areas should provide the opportunity of at least 5 acres of contiguous preserved area; and ideally up to 40 or more acres. Service Area N/A Level of Service 12 acres per 1,000 people | ![]() |
Design Elements Natural Areas include any area of existing or restored open lands such as riparian corridors, flood hazard areas, unique geological formations, important habitats, significant plant types or substantial groupings of important plant types, wetlands, etc. The goal is to protect the edges of these areas to maximize intact areas that provide valuable ecosystem services for the community, support preservation goals or enhance the aesthetics and amenities of the area. | |
Park | |
|---|---|
Size | ![]() |
3 - 10 acres, 5+ acres ideal (Neighborhood) | |
5 - 50 acres; 10+ acres ideal (Community) | |
40 acres min. for passive uses or sportsplex uses | |
Service Area | |
¼ - ½ mile (Neighborhood) | |
½ mile - 3 miles depending on size (Community) | |
Level of Service | |
12 acres per 1,000 people | |
Note: Public dedication and acceptance of Parks is dependent on other parameters of the Parks System Master Plan. | |
Design Elements Parks shall generally be at least 300' wide in all directions, except that linear natural features (Greenway) may be designed as a Park with portions as narrow as 40', provided it has significant continuity between other open space features and preserves significant aesthetic and ecological functions. One large/medium tree for every 40' of street frontage to relate the Park to the public realm, plus other landscape to support the overall Park design. Between 15% and 50% of the area should be allocated to structured recreation such as ball fields, playgrounds or sport courts. The remainder of the area should be allocated to ground cover, treed areas, gardens, lawns or other landscape amenities. | |
Trail/Greenway | |
|---|---|
Size | ![]() |
20' min. width; 30'+ ideal, but dependent on topography and natural features. | |
Trails/Greenways shall be located to provide continuity through the area, with existing or likely connections to other supporting facilities and the ability to link important destinations for those on foot or on bicycle, such as parks, schools and community centers or other civic destinations. | |
Service Area | |
⅛ mile, or ¼ mile from access point | |
Level of Service | |
12 acres per 1,000 people | |
Note: Public dedication and acceptance of a Trail/Greenway is dependent on other parameters of the Parks System Master Plan. | |
Design Elements | |
Trails/Greenways should include a paved or otherwise dust free stabilized surface at least 8' min. width; 10' min. if shared bike/pedestrian trail. | |
The landscape area on each side of the trail should be at least 6', and wider in places to incorporate natural features or significant vegetation. | |
One large/medium tree for every 40' of trail length; and 1 small tree for every 25' of trail length. | |
Trails/Greenways located along rights-of-way may be designed in conjunction with the overall cross section design of the right-of-way to create the optimal multi-modal design for the street and trail. See Parks System Master Plan for specific details. | |
Green | |
|---|---|
Size ½ to 3 acres Service Area 2,000 feet Level of Service 5% to 10% of non-right-of-way land area OR 2 acres per 1,000 people | ![]() |
Design Elements | |
Greens shall be at least 150' wide in all directions, and should have an enclosure ratio (width of space to height of buildings) for buildings on the Green between 4:1 and 2:1. | |
Greens should have a public street along at least 2 sides with direct pedestrian access to the street. | |
Buildings fronting on the Green should be designed with frequent entrances and outdoor seating areas to activate the space. | |
One large/medium tree for every 25' of street frontage; and one small tree for every 2,000 square feet. | |
At least 15% of the area shall be designed for formal gathering such as seating areas and other areas of concentrated amenity that serve as a focal point of the Green. | |
At least 70% of the area shall be allocated to ground cover, treed areas or other landscape amenities. | |
Square | |
|---|---|
Size | ![]() |
¼ to 1 acre | |
Service Area | |
1,000 feet | |
Level of Service | |
5% to 10% of non-right-of-way land area OR 1 to 2 acres per 1,000 people | |
Design Elements | |
Squares shall be at least 75' wide in all directions, and should have an enclosure ratio (width of space to height of buildings) for buildings on the Square between 3:1 and 1:1. | |
Squares should have a public street along all sides and be designed as a focal point for abutting blocks; streets should be designed for multimodal transportation with direct pedestrian access to the street. | |
One large/medium tree for every 40' of street frontage; and one small tree for every 2,000 square feet. | |
At least 50% of the area shall be designed for formal gathering such as seating areas and other concentrated amenities. | |
At least 25% of the area shall be allocated to planter beds, seasonal plantings, foundation plants, gardens, lawns or other landscape amenities. | |
Plaza/Courtyard | |
|---|---|
Size | ![]() |
1,000 s.f. to 5,000 s.f. | |
Service Area | |
On block or immediately abutting blocks | |
Level of Service | |
5% to 10% of non-right-of-way land area OR | |
½ to 1 acre per 1,000 people | |
Design Elements | |
Plazas/Courtyards shall be at least 25' wide in all directions, and should have an enclosure ratio (width of space to height of buildings) for buildings on the Plaza/Courtyard between 2:1 and 1:2. | |
Plazas/Courtyards should have a public street along at least one side; streets should be designed for multi-modal transportation with direct pedestrian access between the Plaza/Courtyard and the street. | |
Plazas/Courtyards should include seating, art, formal landscape and other amenities and ornamentation as a focal point for gathering places. | |
Buildings fronting on the Plaza/Courtyard should be designed as street front buildings with frequent windows and entrances to activate the space. | |
One large/medium tree for every 40' of street frontage; and one small tree for every 2,000 square feet. | |
At least 20% of the area shall be allocated to planter beds, seasonal plantings or foundation plants. | |